He's got less than 20% of Tesla now, but he owns nearly half of SpaceX... bet you he'd be so so sooooooooo much richer if that went public too
That does not take into account that they are increasing the market size themselves with Starlink.
And with Starlink it remains to be seen if that can be profitable. I doubt it. The Starlink satellites deorbit every 5 years and need to be replaced (CapEx+++).
This is compared to the trillion+ EV market.
Both Starlink and Starship are >$5B programs. SpaceX has not raised nor borrowed near enough money to fund both of those programs, indicating that they've got sufficient cash flow to mostly self-fund both of them as well as pay the salaries of >13,000 employees.