I am not saying they are all liars, but who do we trust here? Casino that has made the accusation or player who has been accused.
Creating a threat this days to complain, without even reaching out to the casinos to know exactly why you got logged out for is like wasting your time IMO.
We have a lot of fake profiles, created to defame casinos; calling them out on crimes they committed. Still on that note, the casinos may sometimes track 2 or more users with the same IP (which can possibly be two different people leaving in the same environment/house)
Nobody is right, until proper verifications on the issue is done, that's all I can say.
Asides opening multiple accounts in a casino, what else can cause it because the gamblers are always claiming that they do not have another account, and the casinos are not always providing proof of the other account when they make the accusation.