I’m curious, if I’m subscribed to a community on an instance, why doesn’t Lemmy “unlock” all of the communities on said instance. I’ve found that despite being subscribed to a few on an instance, my instance seems ignorant of other stuff happening on the instance.
The ActivityPub protocol works by sending out every action on one server to any subscribed server. The subscribed servers save this data and make it available to the local users. If it worked the way you described, every server on the fediverse would store all the data from the whole fediverse. That seems wasteful.