Twitter's Substack restrictions lead to writer exodus and potential war with rival platform.

Matt Taibbi, one of the journalists handpicked by Elon Musk for his "Twitter Files," has announced that he is leaving Twitter due to the platform's ongoing restrictions on Substack. Twitter has been blocking users from interacting with tweets containing Substack URLs and limiting interactions with Substack's Twitter account. Taibbi claims that he was given an ultimatum to post articles on Twitter instead of Substack. He plans to stay with Substack and start using its new feature called Notes. This is embarrassing for Musk, who has made free speech his brand, yet is cracking down on a competitor.