Promoting gambling shouldn't be considered a bad thing because you aren't forcing anyone to gamble but only promoting it. How many times has an advertisement being called bad because they're doing a promotion that can has addictions. Gambling is for fun and they're promoting for people to come and have fun.
It's bad for some because a promotion like that is very subjective.
You cannot please people just to say that you're advertising a casino or gambling and you're not forcing them to do so.
There's no difference from advertising it and convincing them to try it. And that's why you can't blame the others for thinking that it's a bad thing whenever they see one do it.
But it is a job in the end. We see other people work, and that does not mean they are involving us with joining their profession or activity. I think that you think, that when streamer shows his big wins, people will want to try gambling and also win big. I would lie if I would say that nobody wants to do that. But not many really start gambling after seeing that. If we see a football players earn millions for his performance, we dont quit our job and start training football. As well as we dont buy everything that is advertised during tv breaks.