Hacker News Reader

That hasn't been 100% true for like four years. Most new things in Retail are built on AWS.

Are you certain? As of last year, Amazon was switching to Fastly for their retain images:

https://www.streamingmediablog.com/2020/05/fastly-amazon-hom...

Some retail is definitely on AWS. Source: I work at AWS.

There was apparently always some kind of mix (AWS did start from internal requirements, though it quickly diverged). The OG services like S3 and DynamoDB power a lot of Amazon for sure. There’s been more bed of Amazon moving to AWS, most recently talk about shifting their main DBs.

A few years back Amazon did a party for moving their warehouses off Oracle databases and into AWS Aurora, so that's not entirely true

This is incorrect.

https://aws.amazon.com/blogs/aws/prime-day-2021-two-chart-to...