KYC and Source of Wealth info is pretty common in the gambling industry. For example at the company I worked at when you hit 2k EUR (or equivilent) your account

KYC and Source of Wealth info is pretty common in the gambling industry. For example at the company I worked at when you hit 2k EUR (or equivilent) your account would be locked until you gave information as to where the money came from. It's an overhead for sure but it should be the cost of running a gambling business. Gambling addiction is real and while it is the responsibility of the person not to defraud others to support their addiction the casino should have picked up on it. Just like you wouldn't expect a bar tender to continue serving someone who is practically on the floor passing out.