Many people use private Toto sites on the Internet called "Sports Toto", where money is bet on winning or losing various sports matches at home and abroad, and dividends are paid according to the results. The size of the private gambling market is estimated at 83.8 trillion won as of 2015. It is four times the scale of legal gambling such as Kangwon Land, Sports Toto, Lotto, and horse racing (21.7 trillion won as of 2017). Private Toto sites appeared one by one about 10 years ago and started earning huge profits, and as these rumors spread, they sprung up and grew into a huge market.
https://www.sportstototop.com