Isn't that the standard anyway for gambling platforms? To ask for KYC in the event of big wins or questionable account activities? I don't mind that at all as that rarely happens to me. The last time my account was flagged was for suspicious activity was in 2018 due to the use of a VPN, and that was sorted pretty easily too. Wasn't asked for any KYC but only for proof of address ownership by way of signing a message.