Once you're able to comply to the terms and requirements for their KYC on request you will have no problem using them, if you're not providing the required documents then you may loose access to your account with them and making withdrawal can be as though situation to you even though it appears to be the simplest thing to do, i don't think there's anything that will make a user to purposely desire not to provide his information on KYC except he has no money with them and done using their exchange.