I commend gambling sites where some of them ban the users if they really notice addicted behavior, some of them really don't care about the health being of their players and they just let them play uncontrollably.
Is there a reliable metric to use for that, though? I feel like it will be a tricky standard to use, not to mention that the users could argue that the casino abuses it because they won too much or something else. While it has good intentions, the chance for abuse is not small either. I'd rather let them offer a way to self-exclusion even if it isn't that effective. At the end of the day, the responsibility to control their activity lies with the users themselves.