
Well, it was fun while it lasted. The professional relationship between billionaire Elon Musk, the owner of Twitter, and independent journalist Matt Taibbi hit a serious and possibly irreparable snag late last week following Musk's quixotic decision to suppress links to Substack.
Substack is a newsletter company with a stated commitment to the principles of broad free expression; as such, it is a preferred platform for many independent journalists, such as Taibbi. Twitter and Substack share a major financial backer: The venture capital firm Andreessen Horowitz has invested $65 million in Substack and $400 million in Musk-era Twitter.