[keepper]

It took amazon over over 6 years to do so though.

EC2 was released in 2006. Amazon.com last non ec2 server was 2012. But a lot of features of amazon.com still don't run on the main AWS offerings.

GCP has not been out for that long. Also, quite easier to run an e-commerce site than to run the web's largest search engine as well as the largest email provider, as well as the largest maps provider. Each of these has an order of magnitude more traffic than amazon.com

I'm sure they'll get there though, just not the same scale. Not even close.

[WaxProlix]

Large parts of AWS don't run on AWS either, due to issues with circular dependencies and similar problems. Similarly, if all of AWS onboards to use your AWS service, suddenly that's the business. Your 'real' customers and their traffic are dwarfed by the rest of AWS, making it hard to keep those real customers at the forefront. There's also an issue with those deps of cascading failures; having two separate fabrics/strata for internal and external offerings is similar to having a multi-regional offering in that it's more robust to random failures and such.