First sale doctrine allows you to resell, rent, or giveaway things that you bought without having any claim over the IP. So for products where first sale doctrine applies you can buy it now, and then a few years down the line still use it or sell it to someone else. You can’t do the same with digital games, and that’s the issue at hand, that first sale doctrine is not being follow here, you can’t resell digital games, rent or even give them away.