It's always fun reminding people that the internet was invented by the US military

Yes.

They couldn't possibly make all that money from just Nazis: I'm given to understand they're doing really well these days. I had the impression that Substack became heavily co-opted by anti-Nazis and have done nothing to defend the feelings of the Nazis they're also happy to host. Not sure what the balance is currently, but again: they couldn't possibly be making all that money from just Nazis, and I think that's instructive.