Conveying something to someone in perpetuity (i.e. “selling” it to them) when you don’t have the right to do so is fraud. Just because Amazon or whoever’s right to continue offering the thing ended doesn’t mean their customers’ property rights somehow end with it.

It’s exactly as absurd as a car dealer stealing back all the cars they previously sold just because they ended their agreement with the manufacturer.

There is absolutely no sane world in which stealing your customers’ property could ever be the “only legal resolution!”