Answer: commercialization of sport is the use of sport the make income and profit. This has been a good idea for sport, because it made sports participants to become more serious, with passion so that they can make more money.
Though it has caused some ethical issues, because sport before is just made to entertain people and for fun, now the participants in sport now has the ideology of making income and not to entertain people.
2. Sports has been also corrupted by its role in the world of commerce, because of people who use sports as a bet game. Some business men who use sports to bet now pay an opponent to lose, just to make money, and because the opponent is participating in that sport just to make good profit, he will accept the money to lose. This has lead many sports game to bias result, because it's been bet upon.
3. Sports game has become another commodity, which you can buy and sell. In sports game, football for instance, Cristiano Ronaldo to leave real Madrid to Juventus, because of commercialization, made so many fans of real Madrid move to become fans of Juventus, because of sentiment. Commercialization of sport has brought in sentiment to sports. Players no longer see sports as an area to achieve dream and make name for their country, they now see it as a place to make money, for example in football, Neymar left Barcelona where he was building a good career and making good name for his country, to PSG because of the money being offered to him.
Commercialization of sports has robbed sports it's defining character of carreer achievement and fans entertaining, to become source for income by betting and winning, and for players to make more money.