Oh give me a break. This is nothing but underdog syndrome and indie worship.
Where's your Medal of Honour copied Modern Warfare article?
Where's your World of Warcraft copied Everquest article?
Where's your League of Legends copied Defense of the Ancients article?
Where's your every first-person shooter since Doom copied Doom article?
Where's your every game ever copied every other game ever article?
(I'm not saying I agree with any of these statements, but two games looking and playing the same is hardly anything of a revelation and don't act like this case matters.)
One company saw there was a market for a type of game and they made a product to compete in said market. This is how
every industry works and if you want to go around taking shots at Zynga, you will also have to take them at everyone else, lest you be biased or uncertain of your own standpoint.