No, it changed ownership many times since 1999.

> On July 5 2017, Musk repurchased the domain name X.com from PayPal

They even took a little jab at him when it happened

> "We are delighted to sell the domain x.com back to its previous owner"

Am I crazy or was x.com at one point x-drive, the early online storage company?

I get a ‘godaddy parked’ page for x.com (not even a ‘y’ or a ‘z’): https://thetaplane.com/x.com