It's because it is the very tenant of crypto specially in the beginning, we just need addresses before, specially for withdrawal. After that it's smooth sailing, no need to give your personal information in the early days of online crypto, regardless of what amount you won or trying to withdrawal.

But when bitcoin or crypto grow in the last 5 years or so, regulators pushes every services to to follow AML/KYC policy, hence we are now required to send those information in a casino and obviously, majority doesn't want to because we still wanted to be private and anonymous.

I'll just let the community decide in this case, both have reputations here though but everyone has it's own thoughts on this case.