I have not seen a faction as much extorted as USI. Reasons, they are most active corporate trading faction that is pirated by unlawfuls.
Junkers are quasi lawfuls and less pirated than Zoners even.
Honestly, you cannot count harassment by lawfuls as piracy. It's roleplay repercussions for smuggling contraband and not dealing with criminals docking with bases in plain sight of lawfuls.