Canada

I don't really see that as Substack supporting Nazism per se (though that is the de facto outcome), I see that as Substack supporting themselves, because they get 10% of all subscription revenue. They're using a fervent belief in free speech to justify it, but they just want money. At the end of the day, they have very narrow content moderation policies, so things like this will be allowed to stay (and their subscribers' money will be allowed to remain in Substack's pocket).

For comparison, look to Instagram's recent content moderation policies that allow for open Nazi rhetoric to remain on the platform. But ultimately, yes, it does seem that they are openly hosting content and facilitating payments for Nazis and defending that choice. I wonder if they're in a financial bind or if they truly are that zealous about (nearly) unmitigated free speech on a private hosting platform.