Even the legit services are hard to trust in these KYC matters because they store these data with some third party software where privacy breach can happen anytime or they could sell your data on dark web using it for illicit works so how do you remain anonymous in this market is what makes you safe.
Not all legitimate services cannot be trusted to maintain data privacy so we should not be pessimistic about this and assume all legitimate services cannot be trusted. I'm sure the casino partners with reputable legitimate services to keep customer data safe and not use it for anything prohibited.