Piracy, while technically in the game, isn't even close to being viable due to numerous missing game mechanics. Such as the ability for ships to easily load and dump cargo, tractor beams, group resource management, profit splitting/sharing, etc., etc. It would take hours upon hours to even attempt pirating something, let alone succeeding.
Now, what's more likely? Players taking anywhere from 2-5 hours to pirate somebody for a very minimal return (and actually succeeding without something glitching out) or players taking 20-45 min to sit outside of port-O with their friends and randomly interdict, shit on, and grief some nerds.