If you remember life online before the days of Friendster, Facebook, and Myspace, this might feel familiar. Everything old is new again, as pre-Mega Social Networks, social groups would gather and collaborate in semi-private spaces that they owned, like chat rooms or forums. Over time many of these social spaces often petered out because people migrated to the bigger networks like Facebook simply because they were free to use and often easier too. Hosting and running a forum, on the other hand, takes both money and time that few people are interested in spending long-term.
The fragmentation that easily happens in decentralized networks can be a blessing, especially for groups that form around beliefs or identities where it can be hard to meet people safely. For instance, those belonging to marginalized groups, or folks with more fringe or misunderstood interests tend to appreciate the in-group feeling they get from a federated social network.