Musk's comment on the matter:<p><a href="https://twitter.com/elonmusk/status/1644638493883211779" rel="nofollow">https://twitter.com/elonmusk/status/1644638493883211779</a><p><i>1. Substack links were never blocked. Matt’s statement is false.</i><p><i>2. Substack was trying to download a massive portion of the Twitter database to bootstrap their Twitter clone, so their IP address is obviously untrusted.</i><p><i>3. Turns out Matt is/was an employee of Substack.</i>