personal relays for storing the data of DMs. Read-only relays meant primarily for a chosen group to publishing to audiences. An encryption methodology for transmitting secret messages and not revealing either the publisher or the audience. Drop-box relays meant to store a message until the recipient retrieves it. Nostr could replace E-mail, no? Nostr could replace retail ecommerce, no? Nostr could replace Internet of Things, no? I could go on and on.

Nostr could replace newpaper journalism. Why use substack when you could publish to a private relay which allows a v4v exchange, or charges per event consumed.