Look at the way he behaves.

People who behave like he behaves without money don’t go anywhere in life because no one wants them to be around. He’d be working at a packing plant somewhere. Or a fast food counter. I say that because the guy isn’t actually intelligent. He isn’t some engineer that designs cars or rockets. He just bought the companies with the people who actually do that. And it doesn’t take a genius to have a lot of money and invest it in safe bets. Look at Donald Trump. Guy is a moron but it’s pretty easy to take daddy’s money and buy/sell real estate. Musk would still look like the Gollum he looked like before he got REALLY rich and paid to make himself look different. He’d be alone, poor, and sad. I mean, he’s clearly sad now because no one who’s happy behaves the way he behaves. He’s lonely because the only people who interact with him are people that want something out of him. He ain’t poor though, so he’s got that going for him.

Of course, if he wasn’t born wealthy he wouldn’t be who he is, so this is all assuming that his personality is the same without the lifelong money, which it wouldn’t be.