iTunes is a specific Apple service, not a platform upon which 3rd party services run. It's one thing to run a product; it's another to run a platform. As a provisioner of PaaS, Apple are not seen as proven.
As for AWS, they're almost ubiquitous. Half the world seems to run on AWS. Regions go down time to time, but half the point of AWS is that it's a distributed architecture that allows apps running on that platform to stay up - usually. Extreme examples (such as dependent PaaS Heroku being taken down) are the edge cases that make it to the press.
As for AWS, they're almost ubiquitous. Half the world seems to run on AWS. Regions go down time to time, but half the point of AWS is that it's a distributed architecture that allows apps running on that platform to stay up - usually. Extreme examples (such as dependent PaaS Heroku being taken down) are the edge cases that make it to the press.