> Your source is Taylor Lorenz,

One of the first newsy types to report this particular issue, but certainly not the only one. See https://arstechnica.com/tech-policy/2025/07/substacks-nazi-p..., which quotes a press release from Substack. Arguably, my source is therefore Substack themselves, via Ars Technica.

> Something which Wikipedia editors would be tripping over each other to evidence if it were true, but their article says nothing about it.

Actually, this information is on Wikipedia. There's one NYT link on the Andreessen Horowitz article, and several paragraphs on Marc Andreessen's. I don't know enough about US politics to know whether all this adds up to "extreme far right rhetoric" (and I'd rather not debate that here), but there's definitely extreme, and right-wing, political advocacy described in Marc Andreessen's article. I have not confirmed whether the claims in the Wikipedia article are correct; if you dispute them, then please let me know as a courtesy (I like having accurate knowledge), then take it up with the Wikipedia editors.

> There is nothing to demonstrate the claim that Substack "continues, proudly" to host such content,

But they do continue to host it. This has been a problem for years (see e.g. https://www.theatlantic.com/ideas/archive/2023/11/substack-e..., https://www.theguardian.com/media/2026/feb/07/revealed-how-s...). Do you need an article from last month? Or do I need to link you to a Nazi blog directly? They are not very hard to find: just type "site:substack.com" followed by some keywords. It took me 20 seconds to find one called "White Free Press", with such wonderful articles as "David Lane and the Foundations of His Racial Ideology", "The Contemporary Conceptual Framework of the White Ethnostate", and "The Immutable Animosity: blacts [sic] hate White People, and Nothing Can Change It".

> It is a known tactic of agitators […]

Quoting the Ars Technica article:

> Of those accounts created in February, only the Substack account is still online, which Fisher-Birch suggested likely sends a message to Nazi groups that their Substack content is “less likely to be removed than other platforms.” At least one Terrorgram-adjacent white supremacist account that Fisher-Birch found in March 2024 confirmed that Substack was viewed as a back-up to Telegram because it was that much more reliable to post content there.

> “Groups that want to recruit members or build a neo-fascist counter-culture see Substack as a way to get their message out,” Fisher-Birch told Ars.

I don't think "this is all some kind of contrived false flag operation" is a particularly likely explanation.