Parler has a much stronger association with socio-political subcultures that like to say things that are, speaking with a generosity that borders on divinity, "

Parler has a much stronger association with socio-political subcultures that like to say things that are, speaking with a generosity that borders on divinity, "controversial". Substack has cultivated a much less culturally biased/extremist writerbase, to my observation. They seem to have successfully targeted writers who just want to write, and not writers who are specifically the angry and disaffected from one side of one part of the world's political binary. I.e. I think Substack's content is less likely to violate any rules (though I can only speak with so much confidence, having not read every article on Substack).