I would ask all those that bought the game to read the terms of agreement. If you dont find a specific line that states that you cant play the game on jailbroken devices, you can perfectly well as for a full return of your money.
Just as anyone who buys a game that changes the terms of agreement after an update. Either I can still play the game unupdated, or I can ask for my money back.
Im tired of this DRM/Online only crap, it should be about time to do something about it.