Money laundering systems aren’t something that run continuously like their daily operations. Instead, they are triggered by specific red flags or events based on the casino’s internal controls.
What I know for sure is that we don’t really know what guidelines they’re following as advised by the regulating agency. But you might be right, they could be using a centralized system.
Because of this centralized nature, criminals or, more specifically, money launderers, can be caught more easily if they’re using crypto casinos for laundering. That’s why casinos have to be very proactive in monitoring activities to do their job effectively. A single mistake could be incredibly costly for them, as they could be accused of enabling such illegal activities.
Provably those launderers could only make their plans to happen if they engage only on those casino which doesn't have any KYC policy. Since they will not be force to submit their identity which I think they are strongly avoid because its easy for them to get caught if they leave tracks on the casino.
But so far never heard any money laundering scheme anymore when this KYC or AML policy has been imposed on almost all of reputable crypto casino. For sure that those criminals is thinking right now its not a good option to wash their dirty money on casino since there's strict monitoring of such illegal activities. That's why I think they choose the other option and stay away using those regulated casinos.