I know Forza tried to implement it, never played that version though.People will always find exploits in a game: the question is how do you allow ai to “gather” user data and adjust accordingly: are there sportsgames that do this well?
As I understand, they implemented it in such a way that there was no AI, but rather it would use driving patterns and styles from a whole bunch of cloud data to simulate real human players. That was the spiel anyway, how it turned out in reality I'm not sure.
This is something that is a lot easier to do with racing games, though - it would be tougher to do it in other types of sport.