of course their subreddit also have their own rules and hate blog posts which are immediatley banned (fair enough)
Mostly this is what I think is happening. They basically hate self-promotion.
Reddit - I have to confess - have higher quality engagement
I've noticed this, too. I only visit Reddit when some Google search drives me there to get some question of mine answered. Other than that, maybe I commented on Reddit a handful of times in my life. But recently, when my Hive posts were getting posted there with redditposh, and I saw hundreds of upvotes, and real organic caring engagement, I was like, This is Cool! This is what's missing from Hive! This is what we writers want!