They aren't the hotbed of money laundering you seem to think they are.
I spent a fair amount of time in the gaming business, and I can tell you that this statement is patently false. Very little of it gets caught, because the people involved in such schemes know what the rules are and simply work around them. Casinos themselves also sometimes turn a blind eye to such activity when it is especially profitable for them. Example [1]. That occurred even with the reporting requirements.
I spent a fair amount of time in the gaming business, and I can tell you that this statement is patently false. Very little of it gets caught, because the people involved in such schemes know what the rules are and simply work around them. Casinos themselves also sometimes turn a blind eye to such activity when it is especially profitable for them. Example [1]. That occurred even with the reporting requirements.
[1] https://www.justice.gov/usao-cdca/pr/operator-venetian-resor...