Legally speaking, there is almost zero difference between a computer game disc/cartridge and a paper book. Are you so deluded as to argue that you don’t own your copies of books as well?
Let’s face it: the situation today is the way it is because some software industry shysters saw the opportunity to pull one over on the courts (with technology-illiterate judges who think “X on a computer” is somehow suddenly different than “X” because ⋆˙⟡ magic ⟡˙⋆) and took it.