Musk is a "trillionaire" because of incredibly overpriced stocks.

[edhopper]

First there is Tesla, with a market cap of 1.5 trillion, that is 6x more than the worlds biggest car maker, Toyota, that outsells Tesla 10 to 1. There won't be self driving cars, or millions of robo-taxis or home robots or any of the other BS Musk promises.
And now we have Space X, which relies on the US government for 90% of it's revenue, and is still losing money. Currently at about $4-$5 billion a year. But that is where Musk has stuck his unreliable AI nobody uses.
So, while I don't underestimate the stupidity of the investor class, these stocks eventually will come back to Earth.