You will have hard time in looking for one that's still non/free kyc casino. Because the majority now asks you verification whenever they want to or when you trigger something like huge wins and withdrawals.
Who told you this? You can gamble on Metawin and be able to withdraw up to $10000 or so daily. There are still some other gambling sites that you can gamble without KYC.
But just that gambling sites are centralized. They can ask for KYC at anytime. I have not heard about anything like that from Metaein users.