Theoretically one of these casino licenses should involve strenuous investigation and verification by the country who has an office issuing them. However in practice most of them are rubber stamp operations that will issue a license to anyone who passes some rather basic checks and can transfer enough money on a regular basis to pay for the fee renewal. There are levels to it, some of the worst jurisdictions will not have any point of contact for a customer who has a complaint about a license holder, it is purely considered an advertising mechanism and to fool the uninitiated. The better ones will eventually take action against license abuse because they would like to keep a reasonable baseline reputation as a cleaner place to hold a casino license.