IMO, I don't mind with some sponsor money as long the streamer admitted on the video he using sponsor money.
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I don't really have a problem with a streamer getting sponsored to try out a casino platform and maybe offer some kind of review for his subs/followers. I won't have any problem with that as far as the streamer is upfront with his subscribers about the fact that he isn't using his own funds but that which the casino gave to him. Sponsored videos/posts are one of the most effective methods of advertising and its done virtually in most industries. For instance, phone manufacturers usually gifts a phone to a tech influencer to make a review.
My point? What matters is that the streamer should be honest about the casino and not just mislead his followers just because he's sponsored.