I have been hypothesizing a case where a legal owner of some digital asset (e.g. a software, film, music ,etc.) is worried about the illegal distribution of the copyrighted material and wants to hire a large number of machines to act as relays on the network to track down the illegal downloads and uploads of the copyrighted material. For this particular example if someone donates enough machines and bandwidth to the network and communicate between the machines they would very likely be able to track down some of the downloads.
Could this idea be turned into a source of business itself? Dominating the network first, and then selling out the information (IP address, time of access, etc.) to the copyright holders?