Usually PD deletes everyones times and you have to do your time all over again, as they put in an in game solution to the cheating.
I've got to be honest though. With no way of checking the leaderboards after the contest ends, aren't these TTs just a waste of time in general until they do?
If we could have them show up on Kudos it would be fun to look back and see how well you did in your region or world ranking. However, for reasons unknown to me, they haven't been added to the K site.
Maybe that's why people are cheating. Because they can. Because PD won't ban them, (just reset the TT board and implement an in game barrier or 2), and because ultimately they view that it doesn't matter?
I'd like to see all cheating desist. I'd like to see PD do a game wide sweep over track limits. I'd like to see the rankings 'mean something' for us and be searchable.
Until then... You'll get incidents like this again.