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.
The KYC should be implemented or should not be implemented. There should not be a case where you won big amount and the site start demand for kyc to withdraw a big amount. Such types of kyc are made mandatory just to avoid withdrawing the big amount of money out of casino.