There are times that I have seen that casinos that when the player uses the VPN and wins, they take the money and do not let it be withdrawn, because they detected the use of VPN, I think that the most logical thing here is for the casino in question to allow to that user to withdraw the money that they deposited, not to keep the money they deposited or anything, but that does not happen, most of the time when things like this happen, what they do is block the account and take the money, which seems very bad to me. For me, things always have to go in a good direction, always acting well, casinos should not fully allow the use of VPNs, what matters is that people get in, have fun, spend money in the casino and get to see the casino as one of the best entertainment platforms and so they continue to spread the word so that this casino is one of the busiest, I think that should be the case here.
Using VPNs is strictly prohibited on many casino sites and it's obvious that they freeze the money because they have to check it for AML regulations.
People have used VPNs to access casino sites and launder money which is why such strict rules have been imposed by casino sites.
If they don't impose such rules then people would easily launder money and that is bad for casino's reputation as well as for the country.
Now, some gamblers will still want to play on that casino and their only means of gaining access to the casino is through the use of VPN, and if the casino notice this and keep quiet about it, they themselves will be in trouble when regulators will come after them for allowing players play from a location or jurisdiction where they are not licensed to operate, this I believe is also one of the reasons why most casinos are so hard on gamblers who flaunt their law of no VPN usage.