It's a general criticism of the system. Highlighting Amazon's particular behaviour is useful as a demonstration of how/where the system fails, and may produce short term wins if it incentivises amazon to stop being inhumane.

I sincerely don't want to oversimplify your argument, but it seems like the logical end-point would be a global socialist/communist society. Is that your desired/intended outcome?

What...?

You get a more functional labour economy by having labour able to access better opportunities. If there's a killer sales agent that won't apply for my sales position because Amazon is dunking him with 14 hour days repeatedly, no one benefits besides Amazon.

I agree, and I would not want to see regulation or laws that prevent labour access to other opportunities. But asking people to work overtime for specific reasons/period doesn't prevent them from looking for other opportunities. That seems like a straw man.

That's a deceptively complex question. I don't necessarily agree that that's the logical endpoint to my reasoning: it might be that we have to continue to appeal to basic human greed/power drives - in a regulated way - in order to progress and develop as a species. It might be that a global socialist society can't do that. I'm not sure. I just think that right now, many developed countries could certainly do with reinforcement of labour rights.

To answer from another perspective, a society resembling something like socialism or anarchism is what I personally would prefer to live in. I have doubts about whether we can move towards that from the current situation or whether it's workable, full stop. But it sure would be nice.