What streamers definitely get is profit, whether it is purely from their activities or they get paid by the casino that collaborates with the streamer. In my opinion, there is no streamer who does not get profit, more or less they definitely get profit. It's just that maybe the videos they show are fake, more for streamers who collaborate with casinos because their main goal is to attract many people to their casino by showing big wins that are easy to get, for streamers who are purely without any collaboration with the casino they get profit from their increasing followers or from the gambling they do.
For those who collaborate with casinos, it is likely that their winnings are fake, but only a few viewers are aware of this.
Of course, most of them are paid, contracts are concluded, but I think not all of them. For example, poker players with a large audience on the stream, the poker room gives them an increased rebate or concludes a contract so that they play only in this poker room and no other. It turns out that the viewers watch this game and gradually get used to it, learn about new promotions and promos from their favorite streamer. As a result, this habit is transformed into the fact that if they start playing again, they will most likely follow the link below the stream that their favorite streamer left and there is nothing surprising in this. I think I even did this.