I worked at AOL back when they did quarterly "staff reductions". They would go and hire lots of them right back; it was an accounting trick. Never mind the fact that families were affected and employees were constantly stressed near the end of every quarter. Those things don't matter, quarterly numbers do when growth has stalled.
This is a great tactic, where competent, good workers find a more stable job, and the ones unable to get a better job are then rehired. On one hand, you can bully them more, and they'll stay, on the other hand, they're so bad at their job, no one else wants them either.
Because of that experience (and lots of other anecdotal evidence), I see no reason for anybody to ever work at amazon unless they are ok with being a contractor.