When the casino take action against them, they start to blame the casino on social media and here on this forum. No matter how much they plan, they can't bypass the casino security system that will detect multiple accounts or VPNs etc.
The casino never reveals the criteria it uses to detect multiple accounts. Some people think changing the internet connection or using a VPN will make them undetectable. A casino can use different ways to detect multiple accounts. It could be wallet reuse, IP address, same device, or even the same browser. There might be other ways that they use to detect multiple accounts, and the gambler do not have any idea about it.
When people think they will be able to dodge the casino, they are fooling themself. They will eventually get caught and later blame the casino. All we can say is sorry to them for getting their account banned.
Casinos have security boards, so suspicious accounts will definitely be detected by their systems, for example by detecting the same IP or device, so you can be sure that the casino will know about this, but players will never be aware of it... they will only realize it when the casino informs them of this finding.
So any abuse will be easy for casinos to detect because they have security departments.