[karlkatzke]

This isn't a loophole. This is by design. AWS wants you to use specific services in specific ways, so they make it really cheap to do so. Using an endpoint for S3 is one of the ways they want you to use the S3 service.

Another example is using CloudFront. AWS wants you to use CloudFront, so they make CloudFront cheaper than other types of data egress.

[lucidguppy]

If they wanted you to behave in specific ways logically - wouldn't their documentation be less ambiguous?

https://www.lastweekinaws.com/blog/aws-cross-az-data-transfe...