As far as I can tell, Elon is 7 for 9. A pretty good track record. Here's a list:
Zip2 Corporation (an online directory) - sold to Compaq for $22 million
PayPal - sold to eBay for $165 million
Tesla - didn't start it but took it over and now worth roughly $386 billion (market cap as of 1/23)
SolarCity - basically gone and is now Tesla Solar
SpaceX - worth $127 biillion
The Boring Company - valued at $5.7 billion
Neuralink (human/computer interface) - worth anywhere from $500 million - $1 billion
OpenAI - nonprofit to develop artificial intelligence
Twitter - now worth $8.63 million, down from $19.66 million prior to Elon buying it
His companies have changed the automobile and space industries forever. Although Twitter, right now, is dying (IMHO)