AWS architects its network to push traffic away from it as soon as possible.
All of the cloud providers tell us not to worry about capacity, etc. - whatever is required, the cloud will scale up accordingly in order to provide.
I've long suspected that each provider has finite capacity and their strategy for handling over-demand is to procure services from another provider.....and that in times of extreme demand, that second provider brings in capacity from a third provider and so on.
How much load is required before the final overflow provider needs more capacity and the whole thing loops back on itself?