Look guys, this is a bit harsh way of saying it, but tough shit. This is exactly what Zynga does. This is not new to them! They copy what their competitors have done and (try to) make it success.
Like Farmville, the game that Zynga is famous for, is it an original game? Of course not. Hell, even their CEO told their employees to just copy the games. And let's face it guys, you didn't really invent tower building games (SimTower anyone?)
Sorry guys, it sucks that it happens, but that's all. Don't make a big deal out of it.