I remember visiting X.com in 2000 or so. Was a bank type website, which PayPal bought up. That’s probably how he got control of the domain. (ETA: more accurate answer below!)
X.com was the online bank that Musk co-founded and that some time after it merged with Confinity Inc. changed its name to PayPal (PayPal was a product of Confinity).
If I recall correctly, he had the x.com domain and tried to rebrand PayPal to X. The board went, "are you a fucking idiot?" and replace him with Peter Thiel.
He's been trying to call stuff "X" since he was an edgy teenager. He just never had the good sense to grow out of it, and he fell ass backward into enough money that we all get to watch him go all "Star Wars kid" over and over again in public.
LOL @ Star Wars kid comment. Gave me a good chuckle. But, that’s not fair to the real Star Wars kid, my brother was just enjoying being him, living his best life! You do him dirty by debasing him to Musk’s level 😂