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.
The world-dominating is largely a negative from my perspective: it pushes it's smaller competitors out of business which decreases the competitiveness of the market and extracts profits/wealth out of local communities where it would likely be spent productively into the pockets of Jeff Bezos and Amazon investors where it is not nearly so useful.
The services they provide have been of incomparable quality to any other offering in the US. They made free 2-day shipping and free returns the baseline. Amazon lockers provide online shopping opportunities to those not privileged to own a house with a secure front yard (I do wish shipping to amazon lockers was possible from other online-only retailers). And in truth the vast majority of amazon’s income is still invested back into the salaries of its workers and building infrastructure — they have notoriously thin profit margins outside of AWS. Bezos’ fabulous wealth comes from stock.
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
In Canada it is possible to order online directly to any post office via a special address and pick up there for free.
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.
Thing is, he does. Else his wealth would quickly evaporate, and he'd be like the CEOs of Fedex, UPS & suchlike. The fact that most of his wealth is in stocks doesn't help.