The update storm: H1 2026 in Search and key lessons for H2

Between February and May, Google surprised us with a Discover core update, a spam update, two broad core updates and the announcement of I/O 2026, all pointing towards an increasingly AI-driven Search experience. 

For most industries, that would be a turbulent half-year. For iGaming affiliates, it was a structural stress test that separated operations built on genuine editorial substance from those that were not.

The March 2026 core update produced volatility of 9.5/10 on the SEMrush sensor, with 71% of tracked affiliate sites experiencing negative impact, making it the hardest-hit category in the update. Some iGaming affiliate domains reported 20-35% declines in organic traffic on their strongest commercial pages, with several losing more than half their visibility on key money pages.

The May 2026 update has now been completed, capping one of the most disruptive update cycles in recent memory. 

This roundup is not a panic piece, nor a prediction. It is a structured account of what took place, what the data shows about why it happened, and what it means for affiliate strategy heading into H2.

February Discover update: A warning shot for syndicated content

The H1 update cycle started quietly. Google's February 2026 Discover update ran for 22 days and largely targeted content in the Discover feed rather than core search results. The pattern it established, though, would reappear more forcefully in March.

Syndicated content took the clearest hit. Yahoo saw a 47% drop in Discover visibility, and sites that republish operator press releases, syndicate bonus content verbatim or rely on aggregated third-party material saw the sharpest declines. 

For iGaming affiliates, the February update was a preview of the March and May logic. Google is increasingly willing to penalise intermediary content, that is, pages that exist to redistribute what better sources already say, regardless of the domain authority behind them.

The operational implication is direct. Any affiliate still running an automated feed of operator promotions or republishing bonus terms without editorial transformation is working with a content model that multiple 2026 updates have specifically targeted.

March spam and core updates: A one-two punch

The spam update went down on 24 to 25 March in under 20 hours, one of the fastest spam rollouts in recent years. The broad core update followed, taking place from 27 March through 8 April.

The speed of the rollout indicated a highly targeted system rather than a broad sweep. The primary targets were manipulative link schemes: PBN networks, rented placements and aggressive link buying.

Incidentally, iGaming remains one of the most link-buying-intensive verticals in SEO, so sites with heavy 'SEO debt' (years of inorganic link acquisition that built authority on paper without matching content quality) absorbed disproportionate damage. 

When you compare sites with steady organic link growth to those with sharp referring-domain spikes, the data tells a clear story. Domains that relied on purchased authority to rank comparison pages and bonus roundups against organically-built editorial competitors are now structurally disadvantaged, and that gap will widen with each subsequent update.

Analysis shows 71% of affiliate sites tracked showed a negative impact from the March core update. Thin affiliate comparison pages, keyword-swapped bonus templates and AI-generated content published without expert review dropped 30-50% in organic visibility. Around 80% of URLs in the top three positions changed, and 24% of the top 10 pages dropped out of the top 100 entirely.

On the other hand, the winners follow a consistent pattern: sites with original data, named expert authors, verifiable credentials and first-hand testing methodology. In iGaming terms, that means affiliates publishing actual withdrawal timelines, documented RTP testing, screenshots of support interactions and genuine playing experience, rather than rewritten operator copy. 

Google appears to have placed greater weight on what analysts call 'information gain': How much genuinely new knowledge does a page add compared to the existing top results? For affiliates who have relied on SEO structure rather than editorial substance, the question is difficult to answer.

The authority consolidation pattern is also worth flagging. Established domain authorities that previously held positions four to eight now occupy the top three. The middle tier of the SERP, where many mid-sized iGaming affiliates have historically competed, is being compressed. The cost of competing at the top of iGaming SERPs has risen, and so has the cost of maintaining a mid-table position.

May core update: iGaming among the most affected

The May 2026 update launched on 21 May, just 43 days after the March update completed and 48 hours after Google I/O 2026, where the company announced what it described as the biggest Search overhaul in a generation. A 43-day gap between back-to-back core updates is the tightest cadence outside Penguin-era refresh cycles.

It was completed on 2 June, after a 12-day rollout, and the verdict across the SEO community is that it hit harder than March. Multiple analysts described it as the more powerful of the two updates, with trackers recording higher volatility than the March release, which many had called underwhelming. 

The rollout did not move in a single smooth curve. Trackers flagged three distinct volatility spikes: the weekend of 23 May, a sharp burst around 30 May and a final surge on 2 June itself. Early winners gave back part of their gains in the later stages, a reminder that mid-rollout movement is not a reliable signal of where a site will land once the update settles. 

For iGaming affiliates, the most important practitioner signal came from the gambling niche specifically. Glenn Gabe of GSQi flagged serious volatility across casino and sports betting sites during the rollout, describing gambling as a hyper-YMYL category prone to major swings during big updates. His tracking showed that gambling sites moved heavily during the late rollout tremor around 2 June. 

That directional pattern matched March. SISTRIX analysis of 8,887 domains found 5,039 winners against 3,845 losers, indicating a redistribution of visibility rather than a blanket penalty. The biggest factors separating the two groups were intent match, market fit and source type. Derivative pages that repackage what other sources already say were exposed, while original destinations and genuinely authoritative content were gained. 

A practical takeaway for affiliates assessing cumulative H1 impact: Compare a clean Search Console window after 9 June against the week before 27 March. That captures the combined effect of both core updates rather than providing a snapshot of mid-rollout noise from either one.

Google I/O 2026 and the AI search overhaul: The longer game

The algorithm updates are the short-term story. Google I/O is the structural one.

AI Mode crossed one billion monthly active users, while AI Overviews reached 2.5 billion. Google described the Search box redesign as its biggest upgrade in 25 years. It now expands dynamically, supports multimodal inputs including images and files, and generates AI-powered query suggestions that pre-load context rather than completing text. Google's head of Search, Liz Reid, said on stage: “Google Search is AI Search”.

The agentic layer is the change with the longest tail for affiliates. Google previewed 'information agents' that monitor the web continuously and deliver updates proactively to users without a user-initiated query. 

For affiliates whose value proposition is staying on top of bonus changes, SERP shifts, and operator news, this creates a new competitive layer that traditional SEO does not address at all. 

Gemini 3.5 Flash is now the default model in AI Mode and AI Overviews, and the redesigned Search box prompts longer, more conversational queries, a direct signal that keyword strategies built around two to three-word head terms need to be supplemented with question-format and conversational targeting.

The YMYL exception

Here is the single most important data point for iGaming affiliates navigating the AI Overviews rollout. For commercial gambling queries, AI Overviews appear significantly less frequently than the 55% average across all searches. The reason, per multiple SEO analysts, is the YMYL regulatory concern: Google is not comfortable generating AI-synthesised recommendations for gambling products the way it does for consumer electronics or travel.

Zero-click rates in AI Mode reach 93% for queries where AI Overviews do appear. For gambling queries where they do not appear, the traditional organic result still drives traffic in the same way it always has. An iGaming affiliate in position one for a relevant commercial query is still getting clicks that a comparable health or finance affiliate may have lost to AI Overviews entirely. 

Still, this is not a permanent advantage. As AI systems mature and regulators develop clearer frameworks for AI-generated gambling recommendations, the protection will erode. But so far, iGaming affiliates are competing in an SERP environment that is less disrupted by AI than most other YMYL verticals, which creates a window that rewards investment in organic quality.

The AI shift in informational queries 

Generative engine optimisation (GEO) is the practice of structuring content so that AI systems (ChatGPT, Perplexity, Google AI Overviews, Claude, and Gemini) cite it when generating answers to user queries. It is not a replacement for SEO, but rather an additional layer affiliates need to run alongside traditional SEO, as AI search handles an increasing share of informational queries.

In the first five months of 2025, AI-referred sessions to publisher websites grew 527% year-on-year. ChatGPT now serves over 800 million weekly active users, and Perplexity processes 780 million monthly queries. At the current growth rates, AI engines will handle a material share of the queries that currently drive iGaming affiliate informational traffic within 12 to 18 months.

The iGaming-specific risk is also worth naming. AI systems recommending unlicensed or offshore casinos is already a known problem. A Guardian investigation found AI assistants directing users to offshore operators in some test scenarios. This creates pressure for compliant, licensed operator-focused affiliates to establish AI citation authority early, because AI systems are going to be recommending gambling products regardless of whether compliant affiliates are cited as sources. 

Only 11% of domains are cited by both ChatGPT and Perplexity, with each engine running distinct selection logic, so ranking well on one does not translate to the other.

GEO essentials for affiliates 

The highest-impact GEO action for iGaming affiliates is the same as the highest-impact March 2026 core update recovery action – publishing original data that exists nowhere else. For a casino affiliate, that means actual withdrawal timelines tested by the editorial team, documented wagering requirement calculations run on real bonuses and customer support response rate tracking. This is the content AI systems cite because it contains specific, verifiable claims that informational queries need.

Beyond original data, affiliates should structure content for extraction. AI systems pull from content that leads with a direct answer and supports it with evidence. The traditional affiliate page structure (broad introduction, long explanation, buried recommendation) is the opposite of what AI extraction favours. Leading each section with a clear, claim-structured sentence and following it with supporting evidence is what GEO and the E-E-A-T guideline both require. 

Bing indexation is the third non-negotiable. ChatGPT's real-time web search is powered by Bing, but most iGaming affiliate SEO teams have never submitted a sitemap to Bing Webmaster Tools. This is a prerequisite for appearing in ChatGPT citations and takes under 30 minutes to address. 

Finally, monitor AI citation baselines now, before the category becomes competitive. Run 20 to 30 highest-value queries through ChatGPT, Perplexity and Gemini weekly and document which sources are cited and where your domain appears. That baseline becomes the reference point for measuring GEO progress over the next 12 months.

What the H1 data means for H2 priorities

The H1 2026 updates produced a clear and consistent signal. Google is raising the bar on what justifies organic visibility for intermediary content, while simultaneously expanding AI surfaces that bypass organic results entirely for a growing share of queries.

For affiliates whose commercial pages held through March and May, the competitive environment at the top of iGaming SERPs is now less crowded than it has been in years. 

Thin-content operators have been knocked back, creating a window to consolidate authority in categories where competitors have weakened. For affiliates whose commercial pages lost significant visibility, the recovery path runs through content substance rather than technical fixes. 

The March and May updates are not penalising the SEO structure, but the absence of genuine editorial value. Recovering pages requires original data, named expert authors and first-hand testing evidence. Rewriting the same content with better structure will not move the needle.

For all affiliates, the GEO build should start now, while the competitive field in AI citation for iGaming is still thin. The window that existed in organic iGaming SEO circa 2021 to 2022, before the major affiliate groups arrived in force, exists right now in AI citation. However, it will not stay open indefinitely.