Banned for repeatedly purchasing items and returning them for a full refund with live hand grenades instead of the original objects.
Banned for repeated shipping requests to regions that are pert of the system but have no physical postal address (e.g. Antarctica, the ISS, Point Nemo).
Banned for shipping “realistic statues” of animals that are, in fact, actual animals.
Banned for selling items for “local pickup” and then placing them in hard-to-reach places (e.g. under overpasses, glued to skyscraper tops, concealed in mechanical spaces).