I don't know - the 'great enshittification' of Substack seems an inevitable event, for which reason I have stayed away from using it as a platform, except for a few experiments. It was initially populated by refugees from Medium, itself enshittified, and there seems no reason that Substack refugees won't eventually become a thing for the same reason. Reminds me of that Twilight Zone (or was it Night Gallery..?) episode with the guy who keeps moving from one sinking ship to another (Titanic, Lusitania, etc.).

The main reason I used Medium was that, for a period, I had personal stuff in a company newsletter and cross-posted stuff on Medium seemed more official than a personal blog. Haven't used it in years.

I do have a Substack account but have zero interest in monetizing and, after a fair bit of back and forth, I just put all my stuff on a Blogger account I've had for years.