what crazy person puts millions of dollars in a hot wallet and connects to a third party lol. It's very unfortunate that incidents like this keep happening, in fact they are not newbies and should really understand that hot wallets are very vulnerable to being hacked, this is plus they are connected to third parties. Turns out there are also millionaires who are stupid. condolences to him.
What made you think that the person that made the mistake isn't a newbie? Is it because of the amount involved. Even newbies could be so much rich. One thing about cryptocurrency is that if you are not careful enough, you could make some mistakes that are laughable. He might have thought of the stress of moving it to cold wallet or has been procrastinating. But where I blame him completely is connecting the wallet with such capital to random websites. Sometimes people who has enough don't value it while some look for little.