Maybe that should be an option?

Probably not a good idea for a business but if you're just using AWS to learn and otherwise fool around with, there's a good argument that it would be nice to be able to have a hard circuit breaker for at least stateless services.

I've actually heard people argue that they consider everything they put up on AWS is ephemeral so a hard circuit breaker should have the option to burn everything down but that seems like it would create its own set of problems for many people. Disabling data egress and EC2 seems as if it would go a long way towards stopping most of the unexpected bill stories.

And, yes, I'm aware of billing alarms and even setting up Lambda functions to take actions but, especially if you use S3 to host files, it would be nice to cap expenses at mostly your storage costs. I was doing some research for a very small non-profit that needs some hosted storage and I think Backblaze B2 is a better choice for them for this reason.