That’s why account freeze initiated by the casino himself for suspected addicted gambler is non-existent because there’s no way to determine online if the user is really addicted or not. Just base on his gambling activity. All casino have self-exclusion feature as an alternative option to fight addiction because no one can determine is addicted except the person itself in an online world.
Although this self-exclusion is rarely being use since it’s very hard to detect addiction by the person itself. So overall casino doesn’t want to meddle on their user personal addiction problem unless the person itself initiated it and not the casino.
An approach would be interesting where the website would try to contact the user in order to understand the situation. If something is found, it would be interesting to freeze the account. I believe this way would be the most friendly way possible.