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All this is correct and should of course be recommended to all novice players. But we should not forget that some people are still too emotional and prone to sudden rash decisions. Again, these are mostly young people and teenagers. Here such a guy will watch another stream with gambling and rush to play himself. And naturally, he will quickly lose everything since he has zero experience in the game and no knowledge of games either. This happens, as it seems to me, quite often and therefore advertising with streams with gambling probably works well in favor of both the streamer and the casino, of course.
Yes, you also right because we don't know who can control themselves while watching videos from the streamers and we also don't know who will get tempted and visit the casino following the streamers. I agree that young people and teenagers can get lured by watching the videos and makes them playing gambling as they will curious how it feels of the winning. Once they feel the excitement of playing gambling, they want to feel again and again so that makes them keep playing gambling in the next days. If they don't have good control, they will just deeper in gambling without they notice and that can also attract them become addicted to gambling easily.
In this process, when advertising from another streamer really affects the immature minds of teenagers, of course, there is some negative feature of such advertising. However, probably only parents are able to protect their children from too much immersion in gambling, and even then, if they have at least some control over the actions of their child. And this control is often simply lost when a teenager enters the "age of denial" and he begins to do whatever comes into his head. At such moments, he naturally runs out of money, he cannot earn it, his parents do not give him money, and he, just watching gambling advertising, begins to play. Then the danger of gambling addiction immediately arises.