Substack faced further criticism in November 2023 for allowing its platform to be used by white nationalists, Nazis, and antisemites.[61] In an open letter, more than 100 Substack creators threatened to leave the platform[62] and implored Substack's leadership to stop giving bigotry a platform.[63] In response, Substack co-founder Hamish McKenzie said the company would continue to allow the publication of extremist views because attempting to censor them would make the problem worse.[11][64]

From their Wikipedia page https://en.wikipedia.org/wiki/Substack

In addition to what others have posted, there was also the time they "accidentally" sent a push notification promoting an actual Nazi blog, swastika amf everything.

I don't know much about Substack, but there are some killer blogs there. For example Kareem Abdul-Jabbar's.

https://kareem.substack.com/

I'm curious too, is this about the owners or the writers?