Billionaire philanthropist John Arnold has noted significant changes in online sports betting since its legalization in the U.S. in 2018, driven by platforms like Kalshi and Polymarket, as well as mobile apps such as DraftKings and FanDuel.
To address potential risks, he is funding $2.6 million in research aimed at understanding the impacts of gambling on financial well-being, mental health, and consumer behavior. Arnold emphasizes that the ease of mobile betting has transformed the landscape, allowing users to place bets with unprecedented speed and frequency.
Recent statistics show that 27% of Americans now have active online sports betting accounts, a rise from 19% in 2024, and the industry generated a record $16.96 billion in revenue in 2025. Arnold argues that while states have been attracted to the tax revenue from legalized sports betting, they must recognize the intensified access and product changes that have occurred.
He draws parallels between the evolution of sports betting and other industries like marijuana and pornography, noting that increased access and intensity could lead to negative financial consequences, particularly for younger men. This issue has gained traction among lawmakers, with various proposals aimed at regulating prediction markets and online sports betting.
Arnold is actively engaging with state legislators to discuss the implications of legalization and the need for appropriate regulatory measures