Seems like a popular strategy! That gambling streaming is crazy, many people talk about it, and it's like even in my opinion, half is OK with that, and the other half think it's unethical! I am not active there, so I don't have any special stand about this... I catch some discussion here and there, and as I said, it's crazy!
Well, any marketing is better than no marketing at all! But Wolf can make some effort for all the players by making some nice promotion with this, not just to think about attracting new ones!
It is basically the most targeted marketing there is for casinos. Who watches streamers that gambles on their streams? Other gamblers. No person who has absolutely zero intention to gamble would end up watching a gambling stream, or even if there are few then they are not that much big at all.
So, I would say that paying a streamer to gamble on your platform could be one of the best marketing any casino could do. Pay as many as you can and cover the whole streaming world if you can afford to, certainly beats paying for a football team to carry your logo, that puts you in front of many different people but some are just football fans, most are just fans actually, gamblers must be a very little thing. Of course, that gives you a credibility as well instead of just bringing customers, so not all casino do it for profit, but more reputation.