That’s actually kind of a brilliant concept that should serve as an example for other video game publishers then: open-source the program so that it can be maintained by the community, but require a license to use the artwork. The community could eventually recreate and even improve the artwork anyway.
Not trying to argue, but I don’t believe I can re-sell my copy of a game I “bought” on GOG, so in my view that’s not full ownership as most people understand it. If you’re a full, legal owner of some property, you can sell that property anywhere you like.