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Because the way these people are treated relies entirely on the fact that their social status and education is so bad that they cannot effectively put demands on their working conditions, it's not like if they quit there is magically a different job on offer they can get to; none of them are doing it out of authentic volition. You're also completely disregarding the fact that people working in amazon warehouses are tracked the entire time, put under a lot of unnecessary stress and denied basic needs.