Isn't this the second time this exchange get hacked? Regardless of how it was done and how big the amount was, I think that hacks will continue until we understand that the solution is to start using decentralized exchanges where users have full control over their private keys.
Exactly, the first hacked happened around June 2018 if I'm not mistaken.
Here is a good link to see the hackers wallet intricate movement of coins.
https://www.ccn.com/newsflash-bithumb-hacked-again-13-million-in-eos-20-million-xrp-on-the-moveBut how can you prevent something this to happened if it's an inside job? Unless they really audit and investigate the people they are going to hire, specially handling those sensitive or data.