From your previous post, you already said that you know people who successfully withdrawn large amount of money without processing a KYC to the site "so far". SO FAR. You also believe that there are big possibilities that for their next transactions, the website where they are playing could ask for them to process it (if  these sites has license, don't forget the possibility of that, though even other casino that doesn't have one has the tendency of asking for KYC documents, which for me, is a shady one.