Well... Consider that Nostr is not really decentralized. The relay model means some large hub and many relays unseen by most, so actual substantial centralization without imposing it formally.
Nostr is awesome for many reasons, but it's not really decentralized. Largely ignoring both the ZeroNet failure lesson, the Usenet success lesson and the eMule/KAD model. If this not change Nostr will remain marginal unfortunately.