There are core differences. With apps it is possible
. You can't "hunt down games". That is why it only affects apps and not the XBox games. It is a matter of practicality. That is one of the possible dangers of DRM, they can shut down your games. With a retail game you still have property of the medium, so they couldn't just confiscate that. Eg, a german court could order Steam to shut down my copy of Dead Rising 2 (theoratically, and the issue would be very different), yet as long as it's possible, it will be an option.
Additionally, I would guess that apps run under a different license than games. An app is probably a "service" and not a finished package like most games are sold. I honestly haven't looked it up, but from what I've seen so far on my phone that seems to be the case.
Well done, you. Except that you didn't bother to check if it ever actually happened, did you?
Well, the game was pulled before I joined. And I stumbled upon threads like this http://www.gog.com/en/forum/toca_race_driver_3/we_want_to_download_toca_forever
which made me think that game wasn't available anymore.
Edit: And GOG pulled various extra for exactly
the same reason. Probably a dozen soundtracks at least ...