An adversary is an adversary, law enforcement or otherwise. If you crowd source a list of that's useful in limiting your adversary's skulduggery, they're going

An adversary is an adversary, law enforcement or otherwise. If you crowd source a list of that's useful in limiting your adversary's skulduggery, they're going to figure out how to become part of that crowd and "contribute" to your list in ways that make it useless. The fix is to get the crowd to participate in some kind of hygiene/self policing activity: Not impossible, but if we had a readily available solution to that problem we wouldn't have governments that don't follow their rules in the first place