Hear me out: A Nostr Service where you can send leaked private keys to:

1. delete everything from those keys everywhere

2. watch for new posts from those keys and delete them as well, forever.

The main idea is to block attackers from using your keys.

The second idea is to let everyone know that their info can indeed be deleted at any time if a person gets your key. If you are using relays that accept deletion events, your Nostr content can be purged from existence.

Have your backups. Don't think relays will be there for you when this happens.