Nostr is great for social. Terrible for private messages. Marmot protocol fixes this.
https://blossom.primal.net/49754a0371445c4f22934bf80afea9ff0f84b05dfd051afea1dbd184097a2a24.mp4
It's terrible because the devs have a socialist mindset where they keep everything for free, so it attracts spammers. I have yet to see any good messaging app on nostr