A theme topic, whatever often talked about on this forum, is the $5 hammer attack.
Many people suggest to keep your bitcoin holdings secret, thus preserving the anonymity of bitcoin to a certain degree.
But then you get sportsbooks asking for photos and passports, and god only knows what else.
If a sportsbook wants all this, I respectly suggest they change to fiat.
If you don't want to give the details then simply change the site you are playing and I think not all the gambling sites were asking for KYC to complete because all they are doing is paying the rewards even in crypto so they might save them from legal actions with the same anonimity you are talking about.
You are right, and we can change the site so we can select the site which doesn't use KYC and I am sure he can find recommended gambling site on here. I am sure many gamblers will feel comfortable with those sites who don't apply KYC because we want to protect our identity. People who know cryptocurrency for a long time will always protect their identity, and they will be not easy to give their identity to another party.