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.).