I'm guessing that it has got something to do with this:

Though, if you got banned because you broke those rules then you can only blame yourself.
Also, you can soon expect to see that the server is ruled by overpowered zenners, since:
Quote:
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Note: Donating will go around this, meaning you can still play and both you and your Family Member(s) will get the ZEN.
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So anyone who has enough money can still get high amounts of zen each day.