>It's an unusual twist on clearing the market

From my experience in the retail/restaurant/hotel businesses, it is a usual twist. It just gets articles about it because it is Amazon and it lands clicks.

These are jobs known to have a lot of turnover and the employers make no effort to reduce turnover, from a combination of their customers opting for cheaper prices at competing businesses with high turnover and employers having (historically) the upper hand in the supply/demand equation for that type labor.