If you guys care about privacy while gambling better re-think before you make a deposit. below you can find a list of casinos which ask/ don't ask for KYC after winning big amounts
I agree with you here.If a casino enforces doing KYC after winning a good amount of money,they should be doing the same before money is being deposited on the account.This is a small gimmick every low graded untrustworthy casino will perform to steal from players as they know people are hesitant towards submitting documents online especially if gambling is not legal in their jurisdiction.
After KYC,there is another gimmick called "Security Procedures" which kinda works the same way.
If a casino is going to ask for your documents then it needs to do that for everyone that plays in the casino, I disagree with idea of a casino that allows you to play and lose without identifying yourself but as soon as you win, you need to go through all kind of KYC policies, that seems dishonest to me because it seems that this is done not as a way to identify users but as a way to try to avoid paying them.