Is it, strictly speaking, possible to pirate a service?
Yesterday's XKCD immediately comes to mind.
But seriously (and colloquially) "piracy" is still not specific enough if you're asking a legal question.
Do you mean only plain copyright infringement?
Unlicensed use of spectrum with "pirate radio"?
Secretly re-selling portions of you phone's data plan via tethering?
Bypassing electricity-meters and wiring your house up to the grid directly?
...Abusing a promotional offer that says "one massage per person"?