There is no Nostr source, each software is completely independent from the others. Nostr is just a loose set of idioms they use to talk to each other. The NIPs are just documentation on the specific idioms used that exist to allow new people to write new interoperable software.

There is no Nostr source.

You don't underatand how protocols work. Anyone can fork the standard and improve it if they can't get a nip through. It does not require consensus like bitcoin does. Clients have to be able to understand the rules , that's all.

From the interview and core repo is what I mean: "Further centralization risks come from within. Only insiders admitted by @Fiatjaf have the right to add features to the Github repository. An internal document shared with Forbes shows that he has given seven people the power and few use it. “There are other people that have merge powers here,” he says. “But mostly it's me.” https://www.forbes.com/sites/digital-assets/2023/05/30/bitcoin-social-network-nostr-creator-fiatjaf-/?sh=286c10e011c0