The problem is that licensing is a lot more complicated than for music, as films themselves are subject to a large number of licences (from the music they use t

The problem is that licensing is a lot more complicated than for music, as films themselves are subject to a large number of licences (from the music they use to individual actor contracts) trying to verify every licence involved in the movie allows for online distribution in a flat-fee manner is a non-trivial task. And that's if you can persuade all the movie studios that it's a good idea.