This. It is 100% about being able to license more titles. Many people forget what the early days of Netflix streaming was like. Remember when you needed silverlight to watch on a computer? Remember when you couldn't even get Netflix on Android? Netflix has come a long ways since those days, and they have done a LOT in moving forward fair-use expectations for digital subscription content.
Netflix loves doing DRM stuff "for the studios" as it creates a barrier to entry for other players. If Netflix pushed the truth that DRM doesn't matter, then a competitor might get a studio to sign a nice deal with them.
