OK, so I'm just a random anonymous coward. And arguably obsessed with my hobby. But I'm puzzled that Bezos would be corresponding with MBS on the same device that he uses for potentially embarrassing personal stuff. Isn't that just a totally obvious OPSEC fail? Edit: But that's what he did, isn't it? And how could that be considered safe?
I think this a good question. The problem is that even the head of a ginormous company with a strong connection to computer security generally (through AWS) is going to take actions based on convenience rather than OPSEC discipline. I think it's natural for any given human to chat with all one's friend on the same level, with the same device and so-forth. A given individual can train themselves to have hard walls in…
I mean, I'd be gobsmacked if he mixed personal and business on the same devices. That could be disastrous, not just embarrassing. So a third device category doesn't seem unworkable.
Edit: Also, wouldn't someone like Bezos have security advisers? And how could they have failed to warn him?
One could make a similar argument about MBS, of course.