I think it comes down to demand and supply for jobs.
The only time Amazon was forced to change its ways was during Covid hiring boom where they couldn't compete in the talent market. They were forced to increases their salary bands and the culture was also a bit easy during that time. But starting mid 2022 it's been an employer's market and Amazon is making sure to juice every bit out of its employees while it can
It's not as conscious as that, its an emergent outcome of the snake pit.
Engineers have to spend an inordinate amount of time on "managing up", which means they have very little time and attention to do what would otherwise be a reasonable workload. Additionally, good engineers hate and despise this so it contributes a lot to the burnout.
The only time Amazon was forced to change its ways was during Covid hiring boom where they couldn't compete in the talent market. They were forced to increases their salary bands and the culture was also a bit easy during that time. But starting mid 2022 it's been an employer's market and Amazon is making sure to juice every bit out of its employees while it can