Developers obviously have no direct impact on labor conditions of the warehouse workers. However, all the time-tracking, logistical optimizations, employee monitoring systems, etc. that enable Amazon to squeeze every bit of efficacy and profit out of these warehouse workers had to come from somewhere/someone.

I believe by contributing to companies that are as highly unethical as Amazon, developers are supporting entities that enforce and perpetuate such awful labor practices conditions. I am not assigning personal blame to any developer directly, but I do believe that as developers we need to be more considerate of the downstream ethical impacts that our work may have on others.