Musk is probably a clinical narcissist (NPD). If that's the case, no amount of power, status, or riches (or ketamine) will ever be enough
Their motivations are often cartoonishly superficial and... well... stupid. Stupid in ways that are baffling to most people (even most other neurodivergent). The kind of stupid that drives somebody to secretly pay pro-gamers to play games for them so they can pretend to be a pro-level gamer, only to then expose their own fraud by playing the game themselves on a live stream, without knowing how to actually play it. And then pretending to have connection issues when people start noticing.
I have no trouble believing Musk has simply internalized the identity of being the world's richest man and now has a pathological need to maintain that status, no matter what