I don't understand your logic.
Running a DRM'd piece of proprietary software is the same as running a
non-DRM'd piece of proprietary software.
If you're going to use non-DRM'd games, you might as well indulge in DRM'd
games, and you might as well install Windows.
When you can justify that amount of proprietary software, you only go down a
road of further justifications. Canonical is a prime example of this road.
http://tep.shoutwiki.com/wiki/Software
That link has some great games on it, including Minetest, Katawa Shoujo, Doom
3, Dark Mod, Assault Cube, Red Eclipse...
