Sued successfully?
It's still on going, I think.
But when you can gamble for in game items which can be sold in the Steam Market place for pretend Steam money, and there are third party sites that can easily be used to turn pretend Steam money in to real money it's clear that that even if they do win the laws will soon be changed to cover this loophole.
When the sky above us fell
We descended into hell
Into kingdom come
Mobile Gaming may face some issues with freemium games that rely on luck outside of this too. A lot of nanny states are looking to heavily regulate it because oh noes gambling. Funny side of this is that it isn't the Right that's doing it - its the Leftists who feel that companies are cruelly 'taking advantage' of the consumer.