This hacker attack should open the eyes of holders how dangerous is to hold their funds on exchanges.
I know it is convenient, especially for traders but it is highly risky as we can see and we can lose our funds and could do anything against it in such situations.
First rules of crypto: NEVER LEAVE YOUR FUNDS ON EXCHANGES OVERNIGHT. USE EXCHANGES ONLY ON THE MOMENT OF TRADING NEEDS. Or, at least, do not store more funds than you can afford to lose on random exchanges.
If you do not own the keys, you do not own the coins.