The aspect that makes the fediverse and in particular reddit-likes uniquely adapted to growing in this harsh corporate hellscape has everything in my opinion to do with the critical early seed phase of communities.
When you make a website with its own forum, you have huge friction to overcome with the network effect… but if you are plugging into a federated network than all of a sudden being a tiny community on lemmy with 2 or 3 people becomes an invitation to users passing by who already have an account to start a conversation and create that spark that will grow (slowly) into a real community.
Consider the minimum viable population of users in a community, how many people does there need to be in a room before that warm feeling of a gathering sets in with comfortable conversation naturally occurring? For federated lemmy communities (and similar Reddit-likes) federation effectively lowers that number by a significant amount since it puts doors everywhere that people can spontaneously wander through and contribute small amounts to help kindle a spark and get the community going.
This changes the paradigm of “social media platform metabolism” if you will, it facilitates much more organic early growth in communities.