It was long ago known that Exchanges are not safe to keep your crypto currency. Even then if users are doing are doing at their own risk. Most of them are traders who are trading that is why they keep their cryptocurrency in exchanges.

Even the individual wallets and users records are not safe. In this digital world all digital works are hackable. So nothing is safe word in any manners. It is upto you how safe you are being to handle this and keep your self safe from being hacked.