It’s not a technicality, in fact the spirit of the law is what matters. When you stream a movie on Netflix or hell even on actual over the air digital TV, by any definition bytes are being copied there too. However, you aren’t intending to copy it, just to consume the media and the “copy” is a technical implementation detail. When you rip the library‘a disk or BitTorrent the movie, you are making a copy on purpose, a copy you
could keep (and I bet you or anyone would keep it if you enjoyed it so much you wanted to rewatch it many times). When you choose to erase it afterward, it doesn’t erase your infringing act you did in the first place.
Note: None of this is a commentary on what’s “right” just discussing the legal ramifications. I don’t personally care what anybody does or have energy to convince anyone of anything.