We had an umpire use the no advantage quote on us a couple of weeks ago. The others teams pitcher was stepping up 6-8 inches off of the rubber on every pitch in the first inning. He was asked to watch it. She was not crowhopping, literally walking off the rubber on every pitch in her wind up and throwing from there. When he was asked about it he said "she is not gaining any advantage." He was then asked if our pitcher who had no trouble keeping in contact with the rubber could start off 6-8 inches in front of the rubber. You can imagine what kind of response we were given.
And before you ask, the mound was in perfect condition, no holes, no ruts, no reason that she couldn't stay on. When the other coach heard us talking to the umpire, she gave her pitcher some instruction and for the rest of the game she was only illegal on half of her pitches. The umpire probably thought he was being kind to a young pitcher, but actually he was doing her harm.