The humans in this world are more into tribalism than any non-tribalist form of capitalism or communism.

A tribe of humans who are into working together and being as chill as possible towards enemies can exist - in fact I see an example: most of the devs building nostr as capitalists, including you. The same could be done without currency or capitalism, assuming we still had computers and people who are into working together.

And either way, it would be great if the people building nostr weren't outnumbered by people who are so naturally tribalistic, they have a hard time understanding the issue with censorship... those people don't let communism scale, and they don't let capitalism price oil high enough, among many other good things they don't allow.