Now that gambling is easy to access, we can't tell who are those that involves with gambling, they can discreetly play and enjoy while for those people who are open with their activities they can also use it to have some extra earnings, I mean, streamer nowadays are very open with what they are doing and even they involve themselves into gambling they share it and openly provide the links or ref links of their accounts.
Something that brings them additional money if they will be able to gain viewers and referrals, plus the fact that the casino can also give them additional money for a sole purpose of continuing to promote the site from their SocMed channels.
Casino streamers are usually also paid by the casino they promote, The influencers get two benefits, payment from the casino for the content they create and income from gambling games played at the casino. They are very open about their involvement in gambling, but if there is no prohibition it is not a problem. Unless it is in a country that prohibits gambling, it will become a legal problem that will trap the streamer. The more followers a streamer has, the more expensive it will be, they are used to getting lots of new users who are curious and come in to gamble at the casino.