This thing will be happen if we deal with centralized system. There will be many ways for some hacker to try to hack the platofrm we just have to see it or move our asset to our own wallet like trezor and etc but actually the platfom need centralized exchange to move it to money fiat. But greatfully there are some exchange which can be able to change our money when there is something bad happen. Like last year we all know that the binance exchange had hacked by some hacker, but the exchange was aware/dare to change all of the user asset who has stolen. You may choose such exchange to store your moeny.