>"It makes it impossible for a competitor to dispute the final results."

Yes. That's the purpose.

The teleology of gamified competition is toward declaring a winner. The rules are structured with that in mind. Those rules are different from the marketplace where protesting and litigation are allowed and consequently, declared winners are simply a matter of opinion, not fact.

Accepting mistakes as part of the game is sportsmanship. And it was a game. Best to move on to the next one: http://www.kaggle.com/competitions