Looking into the statistics of gambling is illuminating and depressing. The UK, where gambling is more widely accepted than in the US, sees rates of 40-60% across all adults according to 2016 research. Revenues for casinos are over $100 billion annually, and global gambling revenues, including sports betting and the national lotteries, amount to over $400 billion. That's like the equivalent of the entire software cloud industry. And it asymmetrically addicts and disadvantages the already disadvantaged (see academic research here, here, and here).
It's not a new thing. PFOF has been a contentious issue for more than 30 years. But, with the rise of feeless retail trading options since 2018, PFOF is back in the news.