And there are also casinos that do not require KYC to their customers either withdrawing funds or depositing funds, but for the average standard now the casino imposes KYC for its customers who want to be in their gambling, this is still quite normal in my opinion today even though we have a fear of leakage of our personal data.
Just like you said, it's better for a gambler to first read and understand the rules of the casino before using it. If the gambler is trying to avoid KYC, then they should avoid casinos that request KYC and use casinos that don't require them to do KYC before they can gamble and withdraw. There are some web3 casinos now where you just have to create your account and connect your wallet to start gambling, and after you have won, you can easily withdraw to your crypto wallet as well.
The truth is that regulated casinos will never stop asking for their customers to be KYC'd. If they don't ask for it immediately after registration, they will still ask for it later. Like I already said, any customer that doesn't want to pass KYC should use a Web3 casino that is not regulated and doesn't request KYC. For most of us here who are crypto enthusiasts, we can tell the risk that is attached to KYC. I believe that is why the OP is asking the KYC question because there are some casinos that can also be shady; they just want to get customer details that they could use for illegal activities at the end.