Amazon doesn't seem to get that people are social animals who lend each other their cards and codes. I can't rightly take my palm off and give it to my mum if she is buying groceries for me.

Their shops in the UK have this problem too. My mum and sister went in together and they picked up an item to look at. Then because they passed it to each other before putting it back on the shelf, they both got charged for it.

They just don't factor in that people aren't isolated individuals.