Substack’s cofounders Chris Best, Hamish McKenzie, and Jairaj Sethi tell me in a statement: "Substack was created in direct response to this kind of behavior by social media companies" https://www.washingtonpost.com/technology/2023/08/15/twitter-x-links-delayed/
New York Times spokesman Charlie Stadtlander tells me in a statement: "We have not received any explanation from the platform about this move" and "would be concerned by targeted pressure applied to any news organization for unclear reasons"