My understanding (and to be clear, this is hearsay, I did not seek to independently verify it) is that they will sell viewing information to a channel provider.

My understanding (and to be clear, this is hearsay, I did not seek to independently verify it) is that they will sell viewing information to a channel provider. (so Amazon could find out how often you opened up Netflix vs Amazon Prime Video, or you started on Amazon, closed it, and then opened up Netflix, etc).