If KYC was required for huge withdrawals, it would be understandable, but providing a new site with KYC just for registration is nonsense.
Should not be even for withdrawal, if deposited with no KYC. I see following logic: wanna safety and KYC - play with real money , deposit from a bank account, wanna anonymity first - pay with crypto, withdraw with crypto. Nobody know who you are and if you played or no.
If you provide a reputable gambling site with KYC it doesn't mean they will immediately start sending out your personal info to all the authorities in the world. Basically you remain anonymous to the rest of the world except for the site, and it's not in their interests to treat their customers badly. Requiring KYC for big withdrawals can protect the users from situations when their account was hacked and all their money stolen. If it's your account and your money, you have no reason to rush it and you can be doing it one small part at a time to avoid providing KYC. In many cases it's the thieves who want to withdraw all at ones.