Not to mention that if AWS doesn’t price everything correctly someone will find out how to abuse it. For example, if AWS only charged for outbound bandwidth on S3 I could store petabytes of archives for almost free. If they only charged for storage, I would host all my high access, small size files on there for free. S3 is an oversimplification but it applies to other services. If they don’t charge for every way they can lose money on a service, someone will find it out and abuse it.