The risk with gambling is higher the further away one gets from the top levels of the sport. For example a Kyle Larson makes enough $ as is to risk it by fixing races. At the usac level the temptation would be higher purely from a risk vs reward. Same thing applies with college sports and some of them have gotten in trouble for betting with draft kings or one of the other apps. All usac can do is put in strong deterrents to stop it. Lifetime bans or similar type of punishments if one ever gets caught in a fixing scheme.