Unfortunate, those hackers are really looking for potentital crypto platform thats so vulnerable for a glitch or a so called hacking. This is just an indication to tell us that technology played a vital part that gives us hope and of course worries like this.
Thye are good at hacking but bad as criminals, they cannot sustain and complete their works, the developers are only demanding and threatening but they panic and return their loot, but we should not become comfortable and relax with these hackers they are not going to stop and will map out an escape route, so they will get traced.
They return their loot because there is a big chance that they can be traced because of the mistakes they did, depositing some of it on a centralized exchange in which they can be identified through their ip address or even with their personal information. So that is their biggest mistakes and the only way to somewhat lessen the burden is to give back the money they stole and hide.