Yes, when it comes to KYC verification, then there is only one advantage of it, which is as you said preventing teenagers to gamble on their platform other than this I don't see any usefulness in this KYC verification at all. However, this cannot be stopped as there are still many casino sites where you need to create an account with your email address and you are good to go. Yes, these sites are good for privacy. But they encourage minors to gamble. I am also not in favor of KYC verification but this is something that makes me think about it.