Not to mention, copyright was a concession to encourage creative innovation in order to develop a robust public domain. Every extension of that temporary, every deflection of fair-use rights runs against that mission.
Like the buccaneers of the golden age preying on the Spanish silver train, media piracy plunders from ill-gotten gains, raiding the plunder of marauders.
I can’t speak for the original intent of naming unlicensed sharing after mischief on the high seas, but even in its time it was the sensible alternative to abuses of the ratings by English aristocracy. In the golden age, it was even then preying on plutocrats and imperialists, and it was romanticized, even if only in fiction, long before the term was applied to copyright infringement or media inspiring knock-off content.