I work in the mailroom for a large corporate campus. The Amazon drivers have it much worse than UPS, FedEx and DHL. They are always driving their own private vehicles, and paying their own gas. Are usually overloaded, and generally don’t have any way to sort packages.
Additionally, they’re often sent to our buildings then across the street for one package someplace else, then directly back to us again, sometimes six or more times in a day. There’s practically no optimization to their routing and they have absolutely no ability to correct or self-optimize.