Bitorrent protocol isn't used much by the masses, but it has been around a very long time now, (in computer years) and contuniues to be used more and more.  An amazing protocol that hasn't died and will likely live  longer than facebook or twitter because it does things no other protocol does.  Nostr I think will be the same. Growth is not a metric of its usefulness, not many people use soldering irons but without them the world would be very differnt..