Quite interesting topic, perhaps those who have been banned from casinos it has been because managed to make a deal with supernatural beings, so they always pocket a good money out the casino and get away with it.

Haha, that's one wild theory! Lol. I guess if someone always walks out a winner, people start thinking there's more than just luck or skill at play
., maybe a ghost giving them signals at the roulette table? Lol But realistically, casinos (physical casinos) are quick to notice patterns that hurt their bottom line. Whether it's card counting or just a lucky streak, they'll find a way to shut it down, no supernatural contract needed.