Most people access the Fediverse through one of the large instances: lemmy.world, kbin, or beehaw. New or small instances of Lemmy have no content by default, and can most easily get content by linking to larger Lemmy instances. This is done manually one “Community” at a time (I spent 15 minutes doing this yesterday). Meanwhile, on larger instances, content naturally aggregates as a result of the sheer number of users. Because people generally want a user experience similar to Reddit, I think it’s inevitable that most user activity will be concentrated in one or two instances. It is probable that these instances follow in the footsteps of Reddit- the cycle repeats.
I actually think the Fediverse is in the beginning the process of fragmenting into siloed smaller, centralized instances. Beehaw, which is on the list of top instances, just blacklisted everyone from lemmy.world. Each of the three largest instances now are working to be a standalone replacement for Reddit and are in direct competition with each other. It is possible that this fragmentation and instability? of Lemmy instances will kill the viability of Federated Reddit altogether, but hopefully not.
These are my main takeaways from my three days on the Fediverse. I will stick around to see if the Fediverse can sustain itself after the end of the Reddit blackouts.
Of the themed instances that exist now, I’d be willing to bet that in addition to their local communities they host that they also subscribe to other communities that aren’t strictly related to whatever theme they are going with.
For example, I’m sure the Star Trek instance also subscribes to the lemmy@lemmy.ml community so the admin can stay abreast of Lemmy news. And probably also follows other technology related communities as well.
I think most people would just want to gravitate to whatever they want to be identified with. There’s nothing stopping you from joining a music themed instance and then adding some non-music subscriptions to your list. It doesn’t force those subs on anyone else on the instance.
And if you don’t want to be identified with any specific topic or community, you can always join a general Lemmy instance like Beehaw or Lemmy.world and subscribe to whatever you like piecemeal.