There's also the point about vendor lock-in, in AWS you do need a systems engineer to setup and automate infrastructure, but pretty much everything (aside from a few products like Redshift, Dynamo and EMR is what I recall from my mind) you can port out of AWS pretty easily if and when the time comes to have your own data center and cut some costs.

Google Cloud is a much bigger vendor lock-in, you could not setup the same environment outside of it.