Precisely 

I don’t think we’ll have a truly decentralized web until our digital tools are themselves managed by our web of trust, rather than by digital stewards like primal or standards committees or repository managers. 

Spoken languages are truly decentralized. Who decided the string of syllables we use in English for pencil? No one. Everyone. The question itself is kinda silly.

We need to respond the same way to the question: who decided the json schema we all use for a nostr note? Currently the answer is: fiatjaf. I look forward to the day when the answer is: what a silly question. No one is in charge.