Why isn't it fair? No reason you can't just torrent a 10GB Blu-Ray rip of the movie. It's free, easy and probably takes less time than going out and buying a DVD.
I would say that side-to-side the quality of Netflix-like streaming is A LOT better, at least when it comes to video. Audio is probably comparable since both DVD's and streaming services usually use Dolby Digital or Dolby Digital Plus.
That only applies to work devices. If you're using your personal device, they would be able to see traffic to/from a dating website but not the actual content.