For example, I heard that Stanley Kubrick's student war film he made was actually pretty good. But it wasn't available for sale or stream from anywhere. I found it almost immediately on a (public) torrent site with a decent quality. I've had this experience on a couple of occasions.
It's too bad that Netflix doesn't keep a backlog of old films plus a rotating selection of newer films. But I guess their licensee's business models comes before their customers wants.