The regulator first presented SEO-Butler with an order to stop marketing of illegal gambling websites on its sites on 7 December, 2020.
It then warned on 22 March of this year that if SEO-Butler did not stop promoting these sites, it would be fined.
In response, SEO-Butler issued a letter saying its sites were blocked for users with Norwegian IP addresses.
However, reviews between 19 April and 3 May showed that while many sites were blocked, four sites had dot.no domains and were available to view. SEO-Butler continued to promote illegal gambling on these sites.
The sites in question were Tjenpengeronline.no, Fotballreisetips.no, Finnstilling.no and Startsidendin.no.
As a result, Lotteritilsynet opted to issue a fine.