I've unfortunately worked for multiple multi-millionaires. The richer they were, the more insanely insecure in ways that would blow your mind. The richest would often leave his bank account open on his computer for his staff to see, among so many other examples.
I've literally gained more respect for other rich assholes like Steve Ballmer and Gabe Newell because they don't run their fucking mouths the way Elon does. AND THEY ARE STILL RICH ASSHOLES!