Why would you expect anything else? Amazon is a logistics company like UPS; if Bezos didn't squeeze every last drop of profit from their employees it wouldn't be world-dominating.
Edit: I’m not affiliated with amazon and my acquaintances had very stressful experiences working there. But as a customer I really appreciate their service
Stock ownership should be illegal.
This is IMO a much better solution because post offices are already necessary and present everywhere, and individual retailers don't have to support the option to ship to them.