But of course, that's common knowledge. There are instances like that and that's why some do get called out. Visit the Scam Accusation section of this forum and you will find sundry cases of such littered there. No one calls out or drags a casino for paying them their winnings, the same way casinos don't freeze or interrogate gamblers account for losing. Culprit casinos mischievously find ways around major wins to review huge wins and in some cases ask for further verification. That's if they don't outrightly accuse winners of cheating the system. Cases like this are rampant.