Dumb but honest question: when you report a user, who exactly are you reporting to since there is no centralized hub/server ?
Discussion
You're reporting to relay operators, signaling to other users.
https://github.com/nostr-protocol/nips/blob/master/56.md
Nostr has no centralized authority, meaning the power and change comes from its users. We have more responsibilities as users and developers to keep this out of other's periphery.