If the hacker able hack the exchange, it's a matter of time that they will hack your personal wallet.
It's frightening

We already enter year 2019 but hacker still able to hack, it's really difficult for me to explain the great side about crypto
If these hackers know how to hack the exchange, it is not impossible to protect the account IMO. The worst point is the gaps on the API codes hich can pump any coin on the exchange but we don't know what kind of knowledge they know about the API.