I heard that the All feed aggregates content from all communities that instance members have subscribed to, meaning if I subscribe to a new community, it’ll start showing up in everyone else’s All feed.
Let’s suppose I have an account on an instance with a particular thematic focus. Should I avoid subscribing to communities outside of that theme, in order to preserve the purity of their All feed?
Ahh I think you’re right, I got it mixed up. Users can block communities, it’s whole instances that they can’t block. Only instance admins can do that, via defederation.