I'm not sure that it's fair to ask a random employee (myself) to explain the employee churn for an employer that has over 1 million employees. That being said, it is largely based on the org you're in.

My org (AWS support) has a high churn rate because it's largely seen as a stepping-stone to other places in AWS. People get hired into my org, learn AWS really well, and then go one of a few different places:

- AWS operations (e.g. SOC, NOC) - Service team SDEs - Technical account managers - Solutions architects - Training and certification

Or they simply get enticed to work for someone who uses AWS. I've worked on literally thousands of support cases. I've gotten really good at diagnosing and fixing things on AWS. And as such, I have companies reaching out to me nearly daily with some job or another.

Similarly, for SDEs, working for a FAANG can open lots of doors for you.

The question can be similarly asked: If Amazon is 'lethal' to your career and health as the OP said, why are there so many boomerangs?