They might be looking for something specific. Like they are investigating an individual, or network of individuals, and this is just a piece of that investigation. I doubt they are asking for this to randomly look for opportunities to charge people with a crime related to piracy.
If only we had legal avenues to obtain information from private companies… Oh well.
If you have a valid reason to investigate people, then you can get a fucking warrant. If your investigation isn’t into an actual criminal act, then maybe you don’t really need that data so bad.