Topic 5568183
Have you ever consider that casinos intentionally delay someone's payout specially if this is huge money? Reason being is that,

The longer the withdrawal is pending, the higher the chance the player cancels it and plays again.

And also, suddenly KYC is being asked after that big win, delaying it even further to the point that some gamblers be frustrated and just play their winnings until they lose everything back to the casino?

This seems like a sneaky move by some casinos, but the gamblers must have the emotional and mental stability to resist the urge to gamble with their winnings. If a gambler decides to cancel his withdrawal and spend his profits for gambling(and loses everything), he can put the blame on himself only, the casino can't be blamed for this. If the casino uses various BS excuses to block a gambler's account and steal his money, then the casino should be blamed and the gambler must seek professional help from lawyers.