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.
Basically, this kind people are always not new to crypto but there are truly newbies to how it works technically. One can be in the space for so long and not have a good knowledge of how to protect him or her self from attacks of this nature. It's always sweet when one is a member of this kind of community having gotten the right knowledge on how to protect themselves their wealths are likely to grow because of the basic knowledge that they will gather here.
So considering the fact that this guy in question lost this amount of money, it could be a result of lack of knowledge, you can believe with me that most influencers do not really have the so called bitcoin or crypto knowledge but can have them in their custody because they must have heard of the information at a very beginning stage hence just wager in some cash but at the point where it's required to protect the wallet the may not know those parts and hence being prone to hacks and/or drains.