I absolutely agree with you. But as practice shows, some streamers are willing to advertise not entirely honest promotions and casinos for money. In my opinion, even if the streamer advertises some dubious action he should warn viewers that he got money for this advertisement. This approach makes it clear that the streamer warns his subscribers of the high risk of losing money. Unfortunately, not many streamers do it.
Some streamers of course uses their popularity to gather more players who will play on the platform they advertise some of them guide those newbie comers who wants to use the platform as support, still, it's good if the streamers will guide them to gamble still the end of the day they cannot handle their viewers like to set a limit to their gamble still the players choose the streamers job is to promote the platform and personal advice to them to prevent getting addicted and lose tons of money.
Disclaimer and other informational drive aside from driving gamblers to advertise gambling sites, though most of the time streamers do not care about it, they just aiming for referrals and paid salaries from the site that they are helping. More on cash-cow treatment with those viewers who are watching their stream videos.
And still, after everything, it is the gambler or the viewers that held responsible for any actions that they'll going to take.
No one is to be blamed, those paid streams are part of advertisement. It's not normal to anyone to just follow every streamers
your own understanding will help you not to lose tons of money for the sake of entertaining yourself.