Horse racing. Other sports (such as baseball) there is no advantage for one team to throw the game. There have been players that have thrown a game for money and the league frowned heavily on it.
Indy cars have very limited team cooperation. Target or Penske have had a back marker try to be sure that a faster car from another team doesn't pass them and challenge their team mate who is leading but they are regulated. Can't block and at some point they will be given a blue flag telling them to let the blatantly faster car pass or risk being black flagged.

You're right. Other drivers should not only move over for Alonso but make it appear that he passed them all on his own with his superior skill.