Is it legal for casinos to keep the money?
If the fund is suspected to have come from an illegal origin, the account will be locked and reported to the authorities. After submitting the proof of source and investigation had been carried out, if it turns out the owner's business is legit, the funds will be unfrozen but if he's into illicit activities, the funds will be handed over to the authorities. Also, if he fails to submit the necessary documents, the funds will be handed over to the authorities.