Try to read the entire text you are replying to before you hit reply - I wrote exactly this thing too. However, what you don't realize is that when HDCP has been designed, downloading "from a torrent site" was not an option for most, because the broadband simply wasn't there yet. We are talking year 2000 here, 18 years ago! Stuff like Bittorrent didn't even exist at that time. It has been pretty effective at what it was designed for about 10 years, making sure that the studios got their investment in the tech back. Today it is a pointless anachronism, I agree, but that's irrelevant. It has played its role already.
When HDCP came out, streaming was not yet a thing either due partly to that very reason. Media came on DVDs and later Bluray, and I was ripping DVDs onto my PC so I could watch them on my laptop while on vacation and such. They were pushing HDCP encryption on the disc player to TV link and like most people I simply bypassed that whole chain, ripping the disc from the source. I don't know how much piracy was going on at the time because I never bothered, even back then used DVDs were cheap as dirt from Amazon. Some years later studios made several laughable attempts at releasing digital versions of movies which were so encumbered by copy protection that it was still easier to rip the DVD and get a completely unprotected file that could be played on any device.
When I worked at a company that made devices with HDMI output, the HDCP stuff caused huge problems, it was one of our biggest issues getting our stuff to work with all the broken firmware in various TVs and other devices. Lots of effort, and one of the biggest sources of customer complaints when their TV wouldn't work with our stuff. Usually it was a bug in the TV but of course the first blame came to us. Meanwhile for our automation rack we had a bunch of $14 splitters to strip the HDCP so the video capture servers could "see" the output from the boxes.