At first I thought that substack was part of the Thiel/Musk enterprise or some other messed up billionaire club of political engineering, but not much was offered. Say "Substak is . . . a political project made by extremists . . ." Can't see any evidence of it here.
The other angle I could see is Substack is algo'ing neo-nazi content to folks. But I can't go to cancel mode just for hosting. I can see that getting reductive - who's the hypersaler, who provided the electrons, who's sold them the servers . . . there is no end. It really needs to end with reader.