nostr:npub184cwc849sejs5pr566zcg4pqn53zzk85q70gmwqx7qt77h3suansvet30s The situation you’re describing is precisely why you do not want to be responsible for maintaining a user database, which is essentially a centralized honeypot.
Here’s a recent example of something like that going terribly wrong.
https://mashable.com/article/tea-app-women-safety-hack
