I also don't like the idea of these fake bets but like what the other posts have already mentioned, the forum can't do much about these type of content even if we're successful in driving the casino away from the forum I doubt they'll stop making these type of content since it's out of our reach.
However, this kind of advertisement will attract more players to deposit to their webaite if they see they are able to win huge like that of stremear. The only question that I am confused with is that, what if the streamer won huge using that lent bank roll? Will they give him additional payment?
It probably depends on the type of deal but I think it's unlikely they'll get extra since big wins aren't hard to pull off given that you have tons of bankroll to blow provided by the casino.