It seems to have become a meme because a handful of notable conservatives made a big stink about moving from traditional media to sub stack, and liberal Twitter followed on by attempting to paint substack as the gab of publishing or something.

I agree with you, it’s far from a conservative platform. It’s more so a challenge to traditional media, which I think is threatening to the prominent news types on Twitter.

Substack having a notable conservative presense doesn't imply that all or even most are conservative