Bitchat might be the exception here, I think it is possible that has reached a significant amount of people, as a brand at least. ¯⁠\⁠_⁠(⁠ツ⁠)⁠_⁠/⁠¯ I think unlike atprotocol and Bluesky, I think nostr is probably bigger as a brand of protocol than the nostr clients.