While I don't know enough about this stuff to answer your main question, I will point out that there are some popular curves which aren't tied to any one nation

While I don't know enough about this stuff to answer your main question, I will point out that there are some popular curves which aren't tied to any one nation or agency. Ed25519 specifically has major contributions from 5 different people from multiple nationalities. It's not quite the decentralized ideal you talk about, but it's somewhat close! https://ed25519.cr.yp.to/ https://ed25519.cr.yp.to/