Not OP, but their warehouse associates get literally butt fucked by the company on a daily basis, especially on prime day,. The two prime days I worked were both two 12 hour shifts on top of my already 40 hour work week. They try to make it "fun" by doing prizes and raffles and shit like that, but they also increase your expected rates on those days, meaning you need to work harder just to maintain good standing.
Corporate Amazon is a different story though, but equally as exploitative of their workers. I had a friend from college who works in corporate and management will literally try to pit employees against each other to increase productivity. It's a pretty toxic work environment where you can't really trust anyone of your peers because any weakness they dig up on you they will exploit to get ahead.