Most instances were in Switzerland as I mentioned, although a few were in the EU. Some weren't defective items but rather unneeded items. Returns based on changing one's mind, even if the item is in unused condition and remains re-sellable, seems to not be a "thing" in at least several European countries whereas American consumers typically expect these consumer protections not by law but by convention.
Another electronic device was defective, and even after selecting this in the online purchase return form I was charged a restocking fee despite returning the item within a few weeks of purchase. Not budging on this and refunding the fee would be unheard of for any serious US retailer.