I think it’s a convention taken from math notation conventions.

“If Rome possessed the power to feed everyone amply at no greater cost than that of Caesar’s own table, the people would sweep Caesar violently away if anyone were left to starve.”

• Eben Moglen

I think imposing artificial scarcity on art, information, and tools; and rationing based on those with the ability to pay is immoral. I mean sure, most art that people pirate is just empty entertainment. But imposing artificial scarcity on tools (software such as OSs, CAD, productivity software, etc), news, and academic papers behind expensive licenses that many cannot afford to pay is objectively immoral. If piracy did not exist, I am positive the world would be without many of the technological advances we have today.