Extracted the numbers from the article, which is in prose instead of table form. It looks like most of these numbers are estimates from William Blair[0], not Amazon itself.

Gross margins by service:

* EC2: ~50%

* S3: 50-70%

* EBS: 60-70%

* Aurora: 65-75%

* Bandwidth: 99%

* AWS Marketplace: >30%

[0] https://www.williamblair.com/