Even Zynga and others have to deal with cheating !
Just take few minutes to find a software or tutorials to do so !
For example (found in 2 minutes) :
//http://cheating-games.blogspot.com/2011/09/empire-and-allies-hack-tool-vip-v52.html//
And same thing as you know with the appstore ! Everything is hackable.
The only thing to think is: Do cheaters alter the games of non cheaters ! What kind of proportion would they represent and is it worth to spend ressources on that.