Theoretically, it shouldn’t matter.

In the ideal case every connected server should host a full and complete copy of the data from the originating server (as [email protected] says, that’s B)

Reality is a bit different, but not enough to warrant always picking B. Just share whichever you’d like, but B is the most right.

Yes. When the reply is posted to C, it is sent to A. A then sends as:Announce to C, as well as any other communities that follow it.

B seems to be irrelevant here.

Hi! We should chat.

NodeBB also does this, and currently still does. A category (group actor) can follow another category (also a group actor).

It essentially is synchronization of categories using 1b12.

Proof of concept does work but it needs reworking in some ways. The largest issue is that Lemmy itself doesn’t understand when a group actor tries to follow a community.

Tell me about it! There are some very cool people (i.e. [email protected]) working on content classification and tagging so that the burden of filtering out this kind of content isn’t borne by server admins directly.