The self-proclaimed free speech advocate and billionaire owner of X makes a very public move to remind users they don't own their social media accounts on the platform.

Elon Musk's X weighed in on the pending sale of Alex Jones' InfoWars to satirical newspaper The Onion to claim ownership of the the bankrupt conspiracy theorist's accounts on the social media site. Why it matters: X in a Monday court filing argued that its users don't own their accounts and those accounts can't be sold or transferred to a third party without X's permission.