The thing they have to do next, is using another third party app. Using this method guarentees you unlimited video offers. They use third party apps like Xprivacy and Xposed to change their Phone Identification (which offer companies use to identify who and how many video offers they watch) after they force closed and re-opened the Knights and Dragons app. All they have to do is one-click a button, go to sleep and wake up with 500 more gems after a night without even bothering about their Phone or PC. The people I'm talking about are viewing unlimited video offers on rooted phones or on emulators such as BlueStacks.
It is a complaint and I would like it if GREE fixes this. You ask me HOW?! Well, I'll not perfectly explain how to, because this is NOT a tutorial. Recently, I've encountered some people claiming they were getting unlimited video offers and therefore could do top10 runs without paying any money for gems.