Pilling and Barlett (2012) suggested that as the Internet technologies become more mature, the growth of the online gambling accelerates. Claussen & Miller ( 2001) noted that sports gambling and online sports gambling would grow rapidly after the millennium. Additionally, 92% of Americans considered casino gambling as an acceptable entertainment. increased by 15 times while 86% of Americans reported having gambled in 1998, comparing to 63% of Americans had done so in 1975. They reported that revenues from legal gambling including casinos, state-run lotteries, jai alai, horse racing, etc. Claussen & Miller ( 2001) reviewed the development of American gambling industry from 1970 to 1990 s.
The world’s gambling industry has expanded rapidly over the past several decades (Claussen & Miller, 2001 Greer et al., 2022 Huang & To, 2018 Kim et al., 2021 Lock, 2022 Pilling & Barlett, 2012 Zhou 2020).