Film industry lawyer: Tell us everyone who pirated our movies.
Frontier lawyer: We've told you everyone we know of.
Film industry lawyer: What about those people on reddit bragging about getting away with it?
Frontier lawyer: We don't have any way of knowing if those are actual customers, let alone if they're telling the truth. If you have a specific IP you want us to look into, we'd be happy to help.
(later)
Film industry lawyer: Give us the IPs of these users who made comments bragging about getting away with pirating.
Reddit lawyer: No.
Film industry lawyer: Okay, see you in court.