Some gamblers just don't seem to understand that. It's simple: if you haven't done anything wrong,
you won't hesitate to submit KYC to the casino to remove their suspicion.
That's a wrong assumption to make. Maybe I don't want my identifiable information stored in a massive database somewhere that could be targeted, hacked, sold and leaked for free on the internet in the future.
Privacy is your right. When you go to the bathroom, you have a shower curtain above your bathtub, right? When you go to the toilet, you close and lock a door. Why do you do that if you aren't doing anything wrong and have nothing to hide? You are not raping someone in there. You are not selling and buying drugs. You are not torturing humans and animals. What you are doing is taking advantage of your right to privacy.
A willingness to undergo KYC isn't proof you didn't do anything wrong and that you have nothing to hide. People from poor countries will gladly sell you their personal information cheaply.