Your gmail notification point doesn't track, but its the most minimal point so i'll drop it.

I dont think Substack is specially just a Nazi platform. I think they are Capitalists that will use any kind of speech to make money. While bootstrapping, they found a niche in leftist independent journalism. Now, they view far right hate as profitable, both directly with Nazi commentors are being paid large sums to enshittify the platform from far right figures.

They dont care about racism or hate because they are rich and it makes them money. That does make them bad people, no matter how many leftist they also profit from. I absolutely expect they will follow a Twitter style path from here on out, with or without Musk at the helm. Once you let the Nazi's into the bar, they take over by driving everyone else out. Thats what they have done, and will keep doing.

I expect you make some kind of living off Substack? Maybe look into Ghost as an option. They take way, way less money even when fully hosted.