If I'm not mistaken, all exchanges have a feature like this, and also most of them it required 2FA that it's hard to make transaction once your account on exchange gets compromised or hacked.  Good to see that this was saved your assets back and you able to retrieve them.

That's why if we have a plan to leave a huge amount on exchange make sure you had already doubled or tripled set the security level in your account and if it will compromise, you have a chance of getting them back.  Might be also good if you leave only a small amount on the exchange if ever exchange has an exit scam, isn't hurt for you.  We know the golden rule of saving crypto assets, "not your key, not your coins".