1) No it is not criminal. Holy cow, that’s an over-reaction.
2) The poster was not teaching anyone anything but how the exploit works. You are responsible for your own morals and values and what you do with information. Censorship sucks.
Please remember that this is a single-player time-wasting game. Your game was only affected if you chose to use the exploit. If Hyper Hippo lost money, that sucks, but I bet they are learning a lot of important lessons with this game. They didn’t lose any money from the people who reward them for their awesome business practices. They only lost money from people who impulsively spend money to advance their game and don’t care about the developers.