Everyone wants to protect their privacy in everything they do, including gambling. Crypto allows us to do that, although some casinos may now require KYC, which can be uncomfortable for some.
It's perfectly natural to feel uneasy if our every activity is constantly monitored by the government or relevant agencies, especially if gambling is prohibited. So, we choose options that protect our privacy as much as possible, especially regarding transactions.
Yes, it is true that crypto guarantees one's privacy while using it, but these days, government policy warrants that casinos do so to make sure they have details and information of people who play on their platform. If not for such policies, I believe casinos would not bother about demanding for kyc, as that alone is an expense for them, but they have their own ways of fishing out defaulters and cheaters from their system before the advent of government kyc.
There will always be ways to detect users, and governments have all the tools at their disposal, especially those in positions of authority. They will certainly do whatever they believe will benefit them.
I agree with Dan, that if there were no KYC policy, I think casinos would also make it easier for their users to do so. They certainly know that most users are reluctant to undergo KYC. However, they must also continue operating, and one of the things they must do is implement this policy.
I
do not think it will be that easy to detect, except for a suspicious financial cash flow from an account which would attract the government to it, but I believe gamblers are very smart and always know what to do to avoid the government's attention to them, except for those who are involved in financial embezzlement and are looking for ways and where to keep their money or conduit for which they would use to do their dirty deeds.
All these are the reasons why the government is hellbent on forcing the casino to abide by their policies, or they face sanctions, and the casinos too would not want to have any issues with the government and would also want to retain their spot, so they would abide by the government's terms and conditions to operate because they are a business venture too.