Secondly, what is low skill exactly? Can these people not read, write, use Excel and email, could they not do secretarial and other jobs? I bet quite a few of them have degrees. Some countries have free education / upskilling specifically to avoid people getting trapped in this situation, and to improve overall productivity of the economy.
By unskilled I mean that you can be trained on the job in less than a day. It doesn’t mean that the workers don’t have degrees and skills, it just means the job doesn’t require anything. By all means, they can certainly take other jobs but good luck finding a secretarial job for $15/hour.
The Bureau of Labor and Statistics has a lot of info on how they classify “low skill” jobs [0] and even tracks overqualified workers who have more skills but work in jobs that require fewer skills.
[0] https://www.bls.gov/opub/mlr/2017/article/wage-and-job-skill...
The current state is optimal for Amazon only. It's far from optimal for society.
It’s easy for you to theorize what Amazon can do and what they can’t. Amazon has competitors with warehouses. People can work there.
As consumers we can also demand more. But Amazon is probably the best for workers when compared to their competitors.