Glenn Greenwald was able to post his article to substack in its unedited form and link it to his 1.5 million Twitter followers earlier today. From what I can tell, there was a disagreement about what The Intercept thought was appropriate for their platform and what he felt should be published under that banner.

I'm not really interested in litigating who has the "correct" opinion or version of events, but I'm skeptical that the editors' stance of "If you'd like to publish this as is, we'd prefer that you use your other enormous and wide-reaching platform(s) rather than the one tied to our professional reputations" counts as true censorship. Millions of people read his story today.