We are talking about a relatively small influencer, does not even have one hundred thousand followers on YouTube, so it seems logical he is going to be approached by small casinos and bookies which may not be registered, instead of a big casino/bookie with and already established reputation on the internet, the latter ones always go with influencers with millions of subscribers, instead of those who have less than one hundred thousand of people watching their videos.
Anyways, it was a mistake by that person not to ask the casino about their legal status or research themselves before accepting and signing an advertisement contract with them, ironically, now most of the money he got from his contract could end up in the hands of regulators because of the fine being imposed.