but to ask the question... the key elements that can make nostr to succed and still remain permissionless and decentralized are:

- owning of identity, sign-based interaction that cant be exploited easily for a "service provider"

- nostr is a client first-protocol. What makes email so centealized is that it is a server-centric protocol, and servers need static ip, manutention and dont scale well. On nostr, is the client that does all the work, relays are intended to be replicable, sobstitute and simple.