The case of the identical rabbit games
kotaku.com
kotaku.com
If they had never marked it, or placed the mark out in public domain, or bulk licensed the content out with their content release, then this would have absolutely been in bounds to do, although annoying and shitty by the knockoff developers.
Anyway, Kotaku doesn't really dig in to the legalities here. The wolfire release blog post clearly states that the game content is not for commercial release, so I'd think this is the way for Wolfire to approach it.
Why not? They provide a lot of other policing work, like use of wrong APIs, style violations, rejecting your app because there are already enough apps of that kind and you added nothing new, and all kinds of things way more fiddly than wholesale copying. They're taking a nice cut, they ought to be bringing the customer and developers some value for it. Isn't that the whole Apple Store value proposition?
An earlier version of paolomaffei's comment also pointed out that the original post says that only the code is GPL2, and the game assets are not to be resold without permission.
http://hg.icculus.org/icculus/lugaru/file/97b303e79826/CONTE...
Not only are they using unlicensed game assets, but it seems they are violating the GPL as well.
I suspect iCoder knew what it was doing all along.
What Matlin is doing is defiantly unethical but if it's illegal (thanks to the distribution of the media) then it sounds like Apple aren't doing enough for the hefty cut they're taking.