Netflix, Amazon, Microsoft, Apple, Google, Youtube, Twitter, etc.
All of which are now competing for the online streaming world and the control of that fast growing medium.
Which is why they are doing all this buying in the first place. Traditional TV is not a money maker, films and online is where the future (and even the now) is at. Disney will be launching their own online streaming next year apparently, so I imagine they could add a hell of lot more content which they own.