The proces is you report a note, and than it's up to the relay admin to remove it, but because it is broadcasted to many relays at the same time, it's practically impossible to remove everywhere.

This is how a free internet is supposed to work anyway.

People just have to accept what we can't control. 

 Thanks Ralph. Do you know instances of someone reporting a post to a good number of relay admins and a good fraction of the relay admins chose to remove the post?

Or is that impossible or very hard to tell.

I’m assuming relay admins are anonymous or pseudonymous by default or can choose to be. 

 No one knows, we can only guess. Authorities will always try to enforce rules on gatekeepers, but with NOSTR it is much more difficult to track them down. That said, I’m not technically/forensically skilled enough to speak in certainties.