I wish a large, well-behaved, games company would produce a game (totally original, good, but simple), posing as an independent developer, publish it, wait for King/Zynga to clone it, then sue their asses off. Seems to me like they're only getting away with this because they can bully the small guys.
The problem is that game mechanics aren't really copyrightable. Pac-Avoid was likely removed for its obvious trademark infringement (oh, the irony) but you can get away with some pretty blatant ripping off by changing all the copyrightable assets.
