A number of scholars have criticized Coubertin's legacy. David C. Young believes that Coubertin's assertion that ancient Olympic athletes were amateurs was incorrect. The issue is the subject of scholarly debate. Young and others argue that the athletes of the ancient Games were professional, while opponents led by Pleket argue that the earliest Olympic athletes were in fact amateur, and that the Games only became professionalized after about 480 BC. Coubertin agreed with this latter view, and saw this professionalization as undercutting the morality of the competition.