A lot of the Amazonians who had a "mission first" mindset at the mid- and upper-level rungs of engineering and product management all ended up become leadership or executive management at other companies, or founding their own companies.
That said, it is important to highlight the mindset that did help Amazon during it's golden era.
It is from a career perspective - at least at AWS, a large portion of high calibre Engineering and Product Leadership left during that time period and the backfills for those roles just plain sucked.
> same "leaders" now have infected other tech companies with their culture and are actively ruining the industry
In what way? Demanding that people who are being paid $200k-400k TC need to execute and show that they can execute is something which needed to be done in the tech industry.
Where does this come from? Maybe if you're drinking whatever (toxic) koolaid Amazon gave you, but Amazon has a lower profit-per-employee than Docusign: https://www.trueup.io/revenue-per-employee
Not exactly the steward of execution you think it is.