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He made his fortune with x.com. That was the online bank he founded then merged with Confinity to become PayPal in 2000, and it was the PayPal IPO that allowed him to invest in Tesla and SpaceX. He's fond enough of his old company name that he bought the domain back years ago, and is now repurposing it.

Thank you for the thorough explanation! For the longest time I thought he was a founder of Tesla and Space.

Unfortunately, "X" in the context of Elon only brings to mind his SUV of the same name.

He's a bit fixated on that letter.

X.com (banking company that eventually became Paypal)

SpaceX

Tesla models S 3 X Y

Baby born in May of 2020: X Æ A-12 ( https://www.bbc.com/news/world-us-canada-52557291 https://www.usatoday.com/story/entertainment/celebrities/202... )

The rebranding was neccessary because Larry & Sergey got their ABC and Zuck went Meta. It's just a d**-measuring contest.