This is the real problem. Even if you don't run anything in AWS directly, something you integrate with will. And when us-east-1 is down, it doesn't matter if those services are in other availability zones. AWS's own internal services rely heavily on us-east-1, and most third-party services live in us-east-1.
It really is a single point of failure for the majority of the Internet.
It really is a single point of failure for the majority of the Internet.