I believe this is a possibility. There are news about these on the internet. You can browse this site : https://www.gamblingnews.com/news/tag/crime
If you happen to be withdrawing a huge amount of money and then the casino suspended it and ask for KYC including proof of fund, you might probably forced to give the details on where your funds coming from. I think this one depends on how huge is the money on risk.
We have the same thought. I also think crypto casino really doesn't care where the money is coming from except if they are forced to investigate by an unexpected event.