You mustn't have played World of Warcraft, or Candy Crush. They are very addictive. Probably the worst example out there are the 'poker machine simulators', wh

You mustn't have played World of Warcraft, or Candy Crush. They are very addictive. Probably the worst example out there are the 'poker machine simulators', which you can see many in the App Store's top grossing apps. You can put in real money but you can't take any out, and they are completely unregulated unlike real poker machines.