On the other hand this streamers though could be paid so obviously, the results might be rigged so that those watching are going to be attracted. So it's a win-win for this streamers and the casinos or games that they are promoting.
Streamers can also use their capability in order for them to have a referral bonus, I have seen so many streamers now that is getting paid and get commission for advertising some gambling site. Streamers should also fact check the site as well before advertising it in order for them and for the people to have a safe deposit and safe credentials in case that the website has KYC. Some website needed to be legal as well before entering digital casino, it is more hot in the eyes of the government if a streamers promoted it.
Streamers mostly does it with the trusted platforms. As mentioned these streamers will be making a good sum of money through referrals. When a streamer makes in millions often it creates a question, how he's able to make it. Some could've succeeded following it, with big bag of money. This isn't possible for everyone and the same is also a reason for small gamblers losing big expecting big out of small amount of money.
On the contrary, I'm just thinking about this scenario: do trusted platform and I'm assuming they have the reputation and that they are already big, still need promotion from some streamers? Or newly created one, who are just starting this business and wanted to gain that trust from the gambling community will used this streamers to promote their casinos? So it seems that the later will have more benefits if they take advantage of this kind of promotions instead of the already established one, in my opinion.