Asking this kind of question I'm guessing you have zero or minimal knowledge about how technology works. For the record, for years I firmly believe that there's no system that cannot be hacked. Currently, exchanges are the main target of hackers since they are holding a lot of money and they are considered as the crypto "banks". Some may think that it can also be an inside job where someone from the team will be the one who did the hacking. And there's no way their main purpose is to diacourage people from buying cryptos. It's all for the money, pal.