They might be referring to Substack having a very open policy of having writers of any political (and other) affiliation on the platform, but I don't necessarily see it as a drawback to be so neutral.
Might be the allegations such as those made by David Farrier this August[1]
> Then, last month, Substack sent out a push notification to some users of the Substack app encouraging them to subscribe to a Nazi newsletter. Like, full-Nazi stuff. Not subtle:
followed by a screenshot of a Substack profile full of swastikas describing itself as news for the "National Socialist and White Nationalist Community"
tomhow|5 months ago
Eschew flamebait. Avoid generic tangents.
Please don't use Hacker News for political or ideological battle. It tramples curiosity.
https://news.ycombinator.com/newsguidelines.html
_rs|5 months ago
watusername|5 months ago
petralithic|5 months ago
pryce|5 months ago
> Then, last month, Substack sent out a push notification to some users of the Substack app encouraging them to subscribe to a Nazi newsletter. Like, full-Nazi stuff. Not subtle:
followed by a screenshot of a Substack profile full of swastikas describing itself as news for the "National Socialist and White Nationalist Community"
[1] https://www.webworm.co/webwormisleavingsubstack/
th0ma5|5 months ago