I worked at AWS for 13 years. I did “aws call leader” for 7 years, and worked in the reliability org when we rebuilt the coe tool. Ive personally blown up a service or two, and know other PEs whove done the same or larger.
Ive never heard of an individual being terminated or meaningfully punished for making an earnest mistake, regardless of impact. I do know of people who were rapid term’d for malicious, or similar, actions like sharing internal information or (attempting to) subvert security controls.
On the whole I did see Amazon “do the right thing” around improving process and tools; people are a fallible _part_ of a system, accountability requires authority, incremental improvements today over a hypothetical tomorrow.