However, those opposed to gambling were able to successfully ban bookmakers at the turn of the 20th century, which led to the introduction of parimutuel wagering in 1908. The parimutuel system is the primary reason betting on horse racing is legal and has flourished.
To protect the integrity of the game. If athletes are allowed to bet on games, there is a risk that they may be tempted to throw games or influence the outcome in order to win their bets. This could erode public trust in the sport and damage its reputation.