convenience mostly. Having a streaming like UX is pleasant and It’s easier to browse directly from the app instead of looking for a movie to watch , search for it on torrent sites and then download it to watch it.
I mostly watch in 720p and This is why I watch directly on pirate streaming sites instead of torrenting. It’s more convenient for me.
Also, I don’t think piracy is against anything, it’s about making people’s life easier. At least, that’s what piracy is for me.