His net worth has only gone up since he bought it, iirc. Tesla will continue to print money at least for a little while until other automakers catch up on EVs. SpaceX doesn’t seem to have any viable competitors, and both sides of the aisle agree on privatizing space, so that’s a big growth industry. This is the unfortunate fact of capitalism in general and late-stage capitalism in particular.

In cases like this I find that they’re usually related to somebody.