To get access to "all" TV content legally would be hundreds of dollars a month. And for many movies you must buy/rent each individually. And legal TV and movies are much more encumbered by DRM and lock in, limiting the way you can view them. (like many streaming apps removing AirPlay support, or limiting you to 720p in some browsers)
I think Spotify wins over pirating because of its relatively low cost and convenience. Pirating TV/Movies have increased as the cost to access them has.