Depending on the era of the game, you might well own a copy of a game on a disk, just like you own a copy of a book when you buy a book. Weaselling out of first-sale-doctrine stuff came a long time after people started buying video games. A century ago, publishers were trying exactly the same thing with books, and depending on the country, either legislation was introduced that made it explicitly illegal, or the courts determined that putting a licence agreement in a book just meant that the customer got a copy of a licence agreement with their book, not that they were bound by its terms.