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.
I don’t think this is necessarily a defederation issue. I’m running a private instance and should not really have been defederated as nothing comes from my instance except 2 users (of which I’m the more vocal of the 2 of us). I run into the problem you outline all the same. My version will show 2 comments, the origin server will show 11. Sometimes even completely different comments and none of the instances show to be blocking me on their /instance page.
I’m not on either feddit.de, lemm.ee, or lemmy.world’s lists. I still run into this.
What I think is going on is simply hiccups in federation. Instances where one of the instances misses sending an ActivityPub message to all parties and that’s it.
But let’s even say that I am currently defederated. From my understanding this is a temporary measure until stuff settles down a bit.
Well in my case it’s perfectly clear that the problem was defederation because the comments I was able to see with my feddit instance were all there precisely up to the point where a person from lemmy.fmhy.ml, an instance that is blocked on feddit, posted something and everything that was in context of that post was gone when viewed from feddit.