If I had to throw an ignorant theory to the wind, I'd say it wasn't making enough money so they decided to turf it and allocate resources to their new game. I wouldn't be surprised if they are trying the "throw shit at the wall and see what sticks" tactic.

@anon #2: If that was the case they would have just removed or censored the offending content. I seriously doubt they would have removed a successful game over a little offending content.