He didn't keep the x.com domain. He purchased it from PayPal in 2017. [1] Indeed at the time Musk tweeted Thanks PayPal for allowing me to buy back http://X.com

He didn't keep the x.com domain. He purchased it from PayPal in 2017. [1] Indeed at the time Musk tweeted Thanks PayPal for allowing me to buy back http://X.com http://X.com! No plans right now, but it has great sentimental value to me. [2] -- [1] https://www.theverge.com/2017/7/10/15949862/elon-musk-x-com-paypal-tesla-spacex-domain-name https://www.theverge.com/2017/7/10/15949862/elon-musk-x-com-... [2] https://twitter.com/elonmusk/status/884580654117076992 https://twitter.com/elonmusk/status/884580654117076992