Well, Musk is also rich primarily because the stock market is basically Insane Magical Woo-Woo Land where the rules of reality are coked out of their minds.
Like 85% of his value comes from Tesla stock, which is so grossly obscenely overvalued it should basically be criminal. If Tesla was actually valued at a reasonable rate for what it is, Musk would have been just another middle of the pack rich kid and likely faded into obscurity a decade ago. Instead, he's become of some kind of Bond Villain Caricature almost entirely because a middlingly successful car company startup got hyped into the stratosphere and arbitrarily assigned a stock value that would make Scrooge McDuck jealous.
Quite frankly, you could probably solve a shitload of the world's problems by just burning Wallstreet to the ground.