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Re:Ask HN: Why Did Medium.com “Fail"? by lenkite on Saturday February 11, 2023 @12:02AM (#34749752)
Substack doesn't even support markdown yet, right ?
Re:Ask HN: Why Did Medium.com “Fail"? by wkat4242 on Sunday February 12, 2023 @12:27AM (#34760124)
As far as I can see markdown is very popular in developer circles only - I guess due to GitHub popularizing it.

So I could imagine it's not on their radar for something aimed at bloggers - of course some will be developers too but not too many.