- with clients like yours that only allow to follow people, with no 'trending' or #hashtag feeds, the monoculture or excessive promotions do not matter because the user only sees what he wants to see. - yes, note copying does not scale. Some distributed systems model must be enforced, I am not even sure it exists. But another alternative to doom is to become practically divided into clusters of relays, separated by language or other issues. Not by enforcement of any mechanism, just because everybody who matters about this topic on this language will end up publising in the same relays.