Being on Substack solves the problem of censorship by way of one's editor or organization. It re-introduces the problem of unedited journalism; i.e journalism that isn't passed through a degree of peer review to ensure rigour. It seems as though it's no longer guarantee both full journalistic freedom and rigour at the same time.
The "peer review" being provided by most media outlets appears to be worse than useless, as Greenwald's experience shows. Typos and spelling errors can be fixed by machines for a very long time already. Editing for space is less necessary when writing for the infinitely long pages of the web - a good writer knows how much detail their audience wants better than an editor does. It's not clear why news has to be filtered through biased editors anymore when technology has eliminated space and distribution constraints.