Not the first time, not the last. Amazon delivery drivers are terrible in every area. Urban or rural they will find a way to block traffic, especially when there is a nearby way to not do so.
I suspect it's a selection effect. Amazon is a pain in the arse to work for. Decent drivers are in demand. This makes it easy for good drivers to jump ship to other companies. This leaves the inexperienced or just stupid drivers left to deal with the BS.
If you've not driven a van before, they are intimidating to maneuver, at first. It's takes time and skill to spin them on a dime, and slot them in, with awareness of how much space you are leaving. Novice drivers simply lack that skill.
I've seen them deliberately park at a tee intersection to block all three legs rather than any one of them. That's less incompetence and more not giving a shit about other people. Otoh this is in California so that's kinda just how people act.