Why don't the copyright holders go directly after the violators of the copyright? Why do they need the extra judicial policing by Cox? Answer: because they wan

Why don't the copyright holders go directly after the violators of the copyright? Why do they need the extra judicial policing by Cox? Answer: because they want to shift the enforcement costs to Cox. If a copyright violation cost them $150,000 as they allege, it would make economic sense for them to go after individual violators. But it doesn't.