This might be an unpopular opinion but: Don't we encourage people to withdrawal as much bitcoin off exchanges as possible? If a 'hacker' does this instead of the customers, at least someone did. Shouldn't we be thankful to him and his friends which support him along the road?
Discussion
I really hope you are joking.
We encourage people to withdrawal as a way to protect their bitcoin & prevent criminals (institutional or otherwise) from stealing & benefiting at their expense. Withdrawal is not the goal, property protection is.
