You claim it was not used with bad intention and only fun, okay. The facts are, it is an advantage for you to just fly from ground up to floor 2 without using stairs. You did that some day ago, flying from entrance to the top floor of the hotel directly to your room. It's also an advantage to use it to reach inaccessible places, as you did at a turf once.
It may not be with bad intention as in to harm other players or disturb their gameplay, but the rule states
And being able to reach inaccessible places, or quickly go from ground to top floor without stairs IS an advantage.
Do you understand and agree with what I just stated here?