"Bybit CEO Ben Zhou wrote on X that a hacker "took control of the specific ETH cold wallet and transferred all the ETH in the cold wallet to this unidentified address."
From the article. Not that I endorse crypto, in fact I despise it. But at least per this statement, it seems to have been handled offline. How a hacker could get access to this is another story to unpack.
edit: I guess this is the story that "unpacks". One more reason to not believe in crypto.