**voluntary** KYC for an npub would be kind of useful. very simple, take a picture of these three things:
- Your face
- Some government ID
- the npub in question
Timestamp it.
You could use that npub for any "official business" - like agreements between parties who don't otherwise trust each other, say on https://attestr.app
Two people who don't know each other but are known to other people in the world could publicly post their (properly KYC'd) agreements in public.