Earlier quoted context omitted.
You can do all of those things on iTunes or Amazon Video. Why would the movie studios run their own content distribution when it gives them little competitive advantage.
No you can't, all the content there is DRM'ed. I believe many people care about running their videos where they like. For example, Amazon video does not work at all on Linux because there is no DRM support there.
On iTunes, EVERYTHING is DRM free. If you purchase it, you get a mp4 (or mov), and that's it. No DRM.
So nothing is stopping you from paying for much of this content legally.