I wasn't aware of the Substack criticism and it's really interesting. I wrote about this exact topic (moderation) a few days ago and it's not an easy one: eventuallymaking.io/p/is-platfor...
(fun fact: I'm building a Substack competitor and I know I'll have to find an answer to this problem)
Blogs, algorithms, moderation: how do we balance discoverability with user control?