Casinos pay taxes so they must inform about big wings. Winners also pay taxes. You can not win money and not pay taxes for it.
Who doesn't want to pay taxes wins not money, but cryptocurrency. Preferably Bitcoin on the Lightning Network, so it can't be tracked. But the mandatory condition is that the gambling platform must not know who you are. That's why topics like this are needed.
A casino platform runs their business with various types of legal documents. However, if a user does not submit his/her own KYC document to that platform, then that platform will not be able to understand who that user actually is. However, the platform has the ability to track the user's location because when a user registers on a platform, his/her IP address is in the database of that platform. So even if kyc is not done, it is possible to know the location of a user but it is not possible to know who that person actually is. If the government of the country cannot track who is buying gambling, then it will not be able to impose any tax on him/her because the government will have no evidence. This is why everyone prefers to gamble on kyc-free platforms.
In a regulated casino, it's normal for them to ask for KYC (Know Your Customer) from all gamblers on their online crypto platform. They don't force or compel gamblers to submit KYC right away; it’s still up to the players if they don't want to.
However, if a player wins a large amount and tries to withdraw from a casino that requires KYC, they have no choice but to comply with the procedure,
just to be able to get their winnings out, to be honest.