we have seen so many gambling sites here that do not require KYC upon account creation and depositing but when withdrawal comes then there the requirements come .
It's very common in crypto casino and it is also true that a lot of people abuse the system for many reasons like abusing promotion, bypassing limit etc through multiple account. And if casino finds something unusual, they must ask for KYC to avoid possible losses. I don't see anything wrong with that though casino use this as a weapon to lock fund. As long as people lose, no issue, only when they start to win and withdraw, they check the abuse etc.