I believe more and more people will escape to lemmy sooner or later, and I already see 3 different communities for the same thing (selfhosted) here on lemmy. Time will tell which one will be the most active, but lets assume all of them will be equally active and the desire emerges to combine the two communities about the same thing, is that something possible or intended to be possible with federated services?
Yeah, I don’t know anything about the actual ActivityPub protocol, but having communities point to each other seems like a way of not only combining communities, but also letting sub-communities within them merge and fork as they see fit.