The casino can only rely on their available tools on how they can trace their cheaters. Cheaters will always find a way, especially if they see flaws in the casino that banned them, which is why in the scam section we see casino representatives posting proofs or testimony that cheaters keep coming back because they see a flaw in the system. its important that casinos do not show how their system works to avoid cheaters studying and finding a flaw in their system.
No matter how good the system implemented in a casino, there are still loopholes that can be exploited by people who are capable of committing fraud. I don't know if casinos share how their systems work or not, but most of the time I don't find that they do. Casinos will definitely cover up information about how the system works, only that people who have the ability can easily commit fraud on their site. The security system that is made is sometimes quite good and they even strengthen the security system in a more sophisticated way, but there are also times when they can be fooled by people who have the best abilities with technology.