There is a way for Nostr clients/relays to make money as I have suggested for over a year, but it is not by being Twitter-like clients. Even Twitter doesn't make much money, lol, so that should have been kind of obvious.

Of course, if I had a perfect understanding of the concept, I might have simply done it myself, but here are my imperfectly compiled thoughts on the subject: https://heaviside.substack.com/p/nostrato-how-relational-contracts

As well as an earlier post that is related: https://heaviside.substack.com/p/bitcoin-defunds-the-state-nostr-actually

tl;dr the way Nostr adoption will happen first is with the emergence of peer-to-peer marketplace apps with the two following properties: 1) geographically localized (i.e. not Ebay); 2) a real time or near real time component (i.e. not Craigslist).