Amazon eng manager here, at least for one more day. I think Amazon is easier to get into than the other FAANGs (I've worked at two of them and was very close to getting into another). This is partially because it's easy/required to manage people out, and partially because Amazon has a rotten reputation in the industry.

It even feels like some teams hire low performers specifically to feed to the pip machine. Supposedly the idea of having a bar raiser in the interview dissuades that, but it certainly feels this way at times.