'Cos SAFE isn’t released yet?
You’re aware you’re posting on a forum about a technology which isn’t finished, released and functioning yet? That question could be extended to the whole of SAFE…
So SAFE would be the example you’re looking for, I think.
Aaaand I don’t elaborate on policing content because it’s a different point (and off topic) as to whether it’s technologically possible. Something which you stated isn’t possible (without basis or clarification I might add), but I countered with some facts about SAFE technology and how the network can function.
If you want to read about policing of copied content – a contentious issue for the Internet / world at large as well as SAFE – there’s a thread here: Dealing with copied content