Although we also know that Amazon wouldn't be such a big success without all the NDA's. There is no knowledge dilution because of this legal setup and this secrecy of real innovation in Bezos company has given him a three year advantage with AWS on Azure around the corner and Google cloud in Silicon Valley not to speak of Apple.

While you could rent GPU's in 2015 from AWS the competition could not deliver a GPU without calling it Alpha until the end of 2018.