Rubber banding is technically not cheating as it's there to balance the game.
But the game is balanced.
All the cars go at the same speed.
It would be unbalanced if the ones behind were faster.
It would be like... let's use League of Legends for example... Giving someone 50 more gold for dying than they do getting a kill. They shouldn't be rewarded for dying in the first place, let alone, be more rewarded than someone who's doing good.