I have spoken to multiple Amazon engineers who build their production services on AWS. (Hint: I never claimed that all of Amazon retail already runs on AWS, nor is that required for my argument.) Zero Google services are built on Google Cloud Platform, and that is not likely to change. The difference shows up in the bugginess of the services. When you annoy internal customers, things get fixed. Meanwhile, there are known issues with Google Cloud Platform that are several years old with no workarounds.