That is the greatness or ingenuity of a casino in inviting everyone to play on their site, instead of hiring several influencers to help promote their site well and even prove to be good at things like that. So it's not surprising that casino owners or founders have their way of advertising their casinos to people who may have a lot of followers. So don't be surprised if more and more people will become familiar with gambling and there will be many more active users there.
When any influencer says anything about the casino or promotes the casino, I am not impressed with it and I do not believe his word. The reason is that there are high chance that the review or opinion may not be correct as the gambling casino may have paid him for this. The same goes for the advisement campaigns being done by the influencer or the one who has many followers. For example, a gambler streamer who has a large audience can be approached by the casino to give good reviews only for the site and in return they may pay him too.
The best casino reviews are those which are done by the real players without any greediness. They will post a good review if they are happy with the site and a bad review if they had a bad experience. The best way to know about the reviews of different gambling sites is to visit the ANN threads of the site on this forum.