Nostr is like putting things on a telephone pole on a busy street corner. You would never do this if you wanted to be “safe”.
How nostr works is not conducive to safety. Users are second class and Relays are first class.
We should look to other protocols for safe and private communication where users have control of their data. Something like Urbit or maybe the next iteration of SSB
March 2024 update
A social network off the grid – mobile and available on Android