Yep one of the streamers who got banend today got an e-mail explaining why. He is a member here so if he wants to chip in he will. Not my place
It makes sense to age restrict gambling because it is a 18+ activity. I'm not a member of YouTube, so logging in will be a problem if I want to see some of the big win videos.
Ok, but why not email first and ban later?
Also, this action is another one of the type "do things that make us look good but are meaningless".
To protect people from gambling dangers you need to educate them. Do they really think it is possible to become 18 and don't know what gambling, cards, poker or slots are?
If you are going to know anyway, shouldn't the effort be that you are properly educated about RTP, playtime, where to play, manage your bankroll, safe gambling, deception tricks in slots and more?
Unless the point is to be completely clueless when they can gamble and lose all the money (now that they have a job) they have!