Their relationship with Facebook probably influenced (compelled?) them to sign onto this. Indeed, one could imagine a potential copyright infringement complain

Their relationship with Facebook probably influenced (compelled?) them to sign onto this. Indeed, one could imagine a potential copyright infringement complaint leveled at Zygna by Paramount, claiming that "Mafia Wars" borrows too heavily from the "Godfather" films. Completely frivolous, indeed, but possibly threatening enough to Zygna's daily operations for them to heed warnings about these bills.