c4a39f1291291d452405cd8ddd798c4a29a3858c52cd0d843f1f6852cf17682e on Nostr: The expiration functionality has existed in Nostr for a long time and almost all ...

The expiration functionality has existed in Nostr for a long time and almost all nostr relays honor it. So yes, you could run a relay that doesn't honor the spec, you can sae a copy of the nostr event, you can screenshot the content. But you'd have to run that off the main nostr network. It's not proof the content will go away, more about expressing intent and most of the nostr software honors that intent.