I've heard of big gambling cases and it happened several years ago an entrepreneur cooperates with casino owners to carry out money laundering
In another story I also heard about the genius promotion of an online casino so they don't spend a dime on promotion but everyone talking about the casino is even published in the online news, so the team from the casino makes big bets or wins big to attract the attention of other players and become a conversation in various gambling communities.
I'm not saying Bitcoinerz does that, it's just knowledge.
Casinos are still considered a very high risk business because it's still a target for money launderers until today, which is why they've got very strict rules in place in regular ones. Accounting is strict, KYC is strict.
Online crypto casinos I don't believe are as vulnerable because every satoshi can be tracked;)