I'd say that for all licensed casinos, even if it is a Curacao KYC is a must regardless if payments are in crypto or FIAT. However, some casinos breach this at their risk. Rather soon all Curacao licensed casinos will start requesting KYC one the account deposit / cashout turnover reaches $2K or equivalent in any currency and enhanced due diligence once $15K is hit. Question is when, but sooner or later it will happen