AWS wouldn't monitor itself from a competitor, of course
Why not? The big tech companies use each other all the time.
For example, set up a new firewall on macOS and you can see how many times Apple pulls data from Amazon or Azure or other competitors' APIs and services.
But the idea that Amazon or Microsoft or Google would host anything at apple is pretty out there.
Apple uses their competitor's services because they can't build their own cloud and host their own shit. The big boys don't use competitors for services they are capable of building themselves.
Why not? The big tech companies use each other all the time.
For example, set up a new firewall on macOS and you can see how many times Apple pulls data from Amazon or Azure or other competitors' APIs and services.