Perhaps this is because Substack is now competing with Twitter through Substack Notes:<p><a href="https://twitter.com/SubstackInc/status/1643630250931232768" rel="nofollow">https://twitter.com/SubstackInc/status/1643630250931232768</a><p><a href="https://on.substack.com/p/introducing-notes" rel="nofollow">https://on.substack.com/p/introducing-notes</a>