By this I sort of mean like, in the case of Lemmy for example, something like a built-in Lemmyverse of sorts.
It wouldn’t be pulling in data yet from other instances, but it would enable seeing that their communities were out there so you could then tell your server you’d like to subscribe/follow/etc. their community/channel/account.
Tbh despite having been around the fediverse for awhile, I’m not sure how else ActivityPub servers were supposed to have these different things found to start with.
That’s kind of what I was thinking may be the case, but I’m not sure if I’m asking this well enough or if I may be misunderstanding ActivityPub.
It’s not clear to me how, without communication/searching outside of an ActivityPub instance, it would ever find other ActivityPub instances to connect to and communicate with.