That's the problem with big winnings, it is certain that the casino will ask you to complete KYC because big winnings are sensitive to casinos but if they have done KYC then there is no need to worry, usually casinos will allow large withdrawals.
All casinos almost have their provision policy with can KYC at any time.
That's exactly what happens. The KYC policy for big wins at all casinos that accept payments in cryptocurrency is pretty much the same anyway. And all gamblers now know this very well and almost all gamblers are internally prepared for two possible outcomes in case of winning. Either the player gives the casino their exact personal data and will receive the money they won. Or the player cannot lose their anonymity under any circumstances and cannot or does not want to give their personal data and then will naturally lose all the money they won. In my opinion, this vision of the situation is now generally accepted and does not present any other solution to the issue to anyone. For example, how to receive a bunch of money won and remain anonymous, which could easily have been done ten years ago.
Now the situation is different, because crypto has been widely accepted as an adoption, the government began to regulate several crypto platforms of all kinds, especially casinos that have licenses, the rules must be obeyed and players must accept that they can send documents to the plaftrom.
10 years ago many centralized platforms still remained anonymous but now it's different, almost all CEXs are required KYC, so casinos are now considered as centralized platforms so KYC will one day become mandatory like Stake.com which has done it at the beginning of the year.