How can it be wrong? If you say so, means that all advertisements that you see every single day on TV, Internet, Newspapers are all wrong?
Come on man, it is all about business. Any business needs advertising and these streamers are part of the business.
It will be wrong if those streamers forces you to gamble, if they gives you guarantee of win although I doubt if it is wrong thing to do since even if there is a streamer give you guarantee of win and you are being fooled of it then it is your own fault.
I do not mean to defend any sites or any streamers who do it, but it is what it is.
We as customers are the one who responsible for ourselves.