A system like that can't have a second books community, let alone a second or third. The current books community has 133 user. They're not going to have 13 communities split between them.

Instead they all have to accept, whoever is the biggest, (realistically, whoever is first) community, gets to shape the books discussion on lemmy forever. That's just how first mover advantage, compounding advantage works in this obviously broken system.

This will certainly spell the end of Lemmy. You think defederation is a problem, You've seen nothing yet.