Twitter blocks interactions on tweets with Substack links

Substack users woke to a strange surprise today when trying to share links on Twitter, finding an error message when interacting with any tweet featuring a Substack link. Tweets with an outgoing link to Substack cannot be retweeted, replied to or even liked. The error message states that “some actions on this tweet have been disabled by Twitter.” The loss in functionality even extends to tools like TweetDeck.