Moving to the cloud was as much an organizational transformation as it was a technical one. And the move to AWS has paid them dividends in organizational and technical agility, as well as execution speed. I will never believe that it saved them money when compared to a well run physical infrastructure that was more purpose built for what they do, but they did not demonstrate the ability to run a physical infrastructure well so it's kind of moot.
It worked out great for them and gave Adrian some great stories to share. Congrats to him on the move to Battery, that's a fantastic team.
I have even heard that a couple AWS service were in fact created because Netflix was asking for it.
Netflix being probably the most visible company on AWS, I am sure they do have some special deal with Amazon.
Anyway concerning the news, it will be interesting to see Adrian in his new role! He is a great guy!
I.e. imagine you want to setup a new courier business. You convince Amazon to move all their shipping to your new courier company, by giving them a price which is almost unprofitable for you. You then make your profit on the excess capacity you have, by selling it to individuals who need shipping at more profitable prices.