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.
Unfortunately there's no such thing as neutrality when it comes to intolerance, because intolerance is viral. I understand the desire to have neutral infrastructure or reporting agencies, but it's more complicated than that.
This. Sorry you're getting down votes at this moment for speaking the truth, but there really is no excuse for anti society anti intellectual illiberalism from the world's literal biggest losers.
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"