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.
When I face this, I will skip that site because I don't want to send any document to them and I think that will be too risky for me. I will search for the other gambling website which doesn't need KYC for the member, so we don't have to verify ourselves. Besides that, we can play without worry, and we can withdraw in anytime without asking the KYC. We don't need to tell other people about how much bitcoin we have, and we don't have to send much bitcoin to any gambling site so we can protect for the other things.