The concept of Know your client regulations and Web3 casinos are not compatible, because the concept of the Web3 itself (not only on casinos but also in any kind of service) is the fact users, clients and gamblers can identify themselves only by holding their personal keys.
I agree with you that governments wont like the idea of such services to become popular, but they already do not like the existence of Decentralized exchanges like Uniswap and there still is, accumulating volume and number of users.
The decentralization makes it harder for centralized entities to attack providers. Bitcoin is a good example of it.
But let's put our thinking caps on. What if we have a decentralized autonomous organization (DAO) for KYC? A place where users get themselves verified voluntarily, their data stored as an encrypted hash on the blockchain. Need to get into a Web3 casino? Flash your hash! Of course, this would need a buy-in from users and a change in regulatory stances. Do we see it happening? That's the million-Bitcoin question!