It's realistically the best-case scenario we can hope for in most cases. If you want all old games to be FREE, then, fine, this won't make you happy. But for those of us who are just happy to be able to play the ancient PC games from our youth on modern systems, and are willing to PAY for it, this kind of license separates the engine from the assets, and effectively requires you to prove that you have bought the game by supplying the assets. But then you can do whatever you want with it to get it running on your favorite Linux distro, etc.

I am personally not opposed to this. It worked for Doom.