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The attraction of substack for at least some writers is that substack actually pays their more popular or prestigious writers. I don’t know how many or whether there is a published list of them, but at least a few of them are getting paid rather well (6 figures/year or maybe more). If Substack is recruiting and paying Nazis, then that is of interest and concern. Most writers there aren’t getting paid by substack, though they may have readers who buy subscriptions. That is open to pretty much everyone and the fanfiction saying “don’t like, don’t read” works for me here. Saying Ghost is a more attractive platform because it has more censorship is kind of a head scratcher. And calling Taibbi and Greenwald Nazis is ridiculous. Disliking the Democrats doesn’t make someone into a Nazi.
That said, I don’t personally like substack very much and am always glad to hear about alternatives.
I don’t think the software matters much tbh. It’s about payment aggregation, search hit aggregation, and for some “prestige” substack writers, actually getting paid by the platform.