The part that runs in AWS could just as easily run on bare metal. Stack Overflow does it, Backblaze does it, Github does it; I'm so disappointed in this tired trite that your a special snowflake running in AWS.
Nothing is going disappear overnight.. AWS iaas services are commodity and not something so unique that are not replaceable with products from other cloud vendors
there are estimates that netflix is consuming about 20% of AWS. AWS does not publish a list of DCs but from regions and AZs you can put a lower bound estimate at 40 so it would be anywhere from 8 DCs to whatever the upper bound is (I guesstimated 20)