Netflix in the US may have a lot of streaming content (movies, especially) relative to their streaming competitors but they have very little streaming relative to all the movies and TV shows that have ever been made. Compare their streaming offerings to their disc offerings and you will find very little of what's on disc is also available streaming.
Discs needs to be snail mailed, so the amount of content potentially available to each subscriber at any given moment is tiny, compared to the content available online at any given moment.
So there are very different dynamics going on there when comparing those services.
