I don't understand how that conclusion follows from the data. Amazon and Netflix have totally different shipping patterns and business models. Nobody forced Netflix to use USPS; if UPS/FedEx was better for them I'm sure they'd use them.
I can't _ever_ see Netflix using UPS/FedEx due to the logistics on the shipper side. The mail is already going to your house, so having a movie dropped in your mailbox isn't going to make a difference. However, if Netflix were to use a shipper like UPS or FedEx, then they would need to drive their truck to your house just to drop off a disc. That's ridiculous.
All of these people balking at the high carbon footprints of these companies would have a fucking field day.
