Not saying where I learned this from, but the Amazon fulfillment services (fulfillment centers and their 1st party delivery services) have a greater than 30% month over month turnover in my region. No one taking these jobs has any intention of making a career out of it and most aren't even planning to work them for more than a couple months at most. That is exactly the kind of environment that encourages gaming the system in the way you describe because the risk of getting fired within the expected time period employment is so low that it isn't worth doing the job right.