Is YouTube the biggest failure in media delivery history?

How many people use YouTube daily? It’s on iPhones, iPads, Androids, Xboxs, PS3s, Rokus, and whatever the hell else.

Why have they never made a major push for a rental service for movies like Xbox has with the Zune Marketplace or even iTunes? The YouTube app for 360 is better looking the then the damn website. 

Everyone knows and uses YouTube. Why not rent movies from YouTube?

Edit: Yes, I know you can rent movies from YouTube. So, what movies have you rented on your Xbox YouTube app? Did you rent The Dark Knight and watch it on YouTube on your computer? Not happening.