While many have seemed to point out the issues with the work here, the more subtle implication in the article is that temporary staffing agencies and the way they facilitate transactional labor are a more serious part of the problem. The Amazon employees have shares, equity, and incentives but the temporary labor does not, and cannot miss a shift. The 4AM Army article in Time also addresses this, and there may be a better middle ground for temporary labor than what is provided: http://nation.time.com/2013/06/27/the-4-am-army/