The publication of notifications from a category into the Fediverse should be possible for categories which are “read only”. In this context, the use-case behind is to to have a publicly available documentation area and “lure” possible readers from outside into Discourse. The category has the following security settings
a) read only for the public (outside Discourse) and logged-in users. Permission “see” for “everybody”
b) writeable only for Mods and Admins. Permissions “see” “reply” “create” for the “Mods” and “Admin” groups
Currently, the ActivityPub settings can be created for such a category, but the actor is automatically disabled again. For reference see