They think that the casino isn't aware of anything and they can do whatever they want. They think they are more clever and can violate rules and casino wouldn't get to know.
This is so true, they think that they're more intelligent than the casino where they are playing and been monitored with the actions they do inside their platforms. They can't just accept the loss and so they create drama in potentiality of retrieving their losses back but no, it won't happen for most of them.
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.
Such abuses will be found out by the casino and that's the reason why when there's a fault on them, the casino don't even want to disclose it. For both sides, it might not be fair but at some point, it is.