And also on the abuser's side there is a proxy and VPN. That is, the online casino will not understand exactly who is logging in with a new username. That's probably why they're introducing KYC, but then again, AI is now great at generating documents, once you show it a few examples. Therefore, casinos are definitely experiencing difficult times in terms of abusers.
In contrast to your argument, I can tell you that online casinos have software tools for calculating the current location of a gambler or bettor. I do not know how they do it, but I saw a couple of casino sites and applications that did not care about the VPN with which I entered, they absolutely accurately wrote my country and language of communication.
I didn't have any malicious intent, and I've never been involved in gambling, but this online casino was apparently very strict and they wouldn't let me register on their website. Therefore, casinos have excellent software protection if they have the money for it.