And I don't understand anyone (especially a left-wing activist) willing to tolerate that,
Sadly because it's easier to spam "Fuck spez" and act like that's doing something rather than make an actual change in their life, like dropping reddit all together. It was one of the things I disliked most about the site.
volunteering to curate content for them, especially after the degradation in service which is affecting effective moderation
My best guess it shortsightedness mixed with power hunger. They probably only see that sweet mod position where you can delete any opinion you disagree with or any user deemed "problematic" without thinking about the work that would actually go into modding a botless subreddit. But that's just me pulling that out of my ass.
But enough about that, I am glad that in some way shape or form, this community is still going!