People have known for years - that’s the really terrifying part. Heck, when I was in business school I wrote a paper on the dangers of sports betting. There were many resources available then…and heck, Gmail invites were a rare commodity when I was in school.
Edit - I just found a printed copy of the paper - I wrote it so long ago that the term 'sociopathic compulsive consumer' was being used. At the time, I found a lot of evidence of casinos using terms like 'instant gratification' in their marketing commmunications. This is over two decades ago. Heck, the actual paper is on a 3.5 inch floppy.
I was briefly involved with a major sports & esports betting company. It was way grosser than I ever imagined, and they had multiple astroturf campaigns working on legalizing betting in more places.
Took me from a generally laissez-faire attitude about gambling, to being entirely on board with simply outlawing at least that sector of it. So very nasty.
(Incidentally, this did answer a question for me: “how did esports get so big so fast, financially?”. Never made much sense to me. The money’s in gambling, and it’s a fucking lot of money. Lightbulb went on and I felt dumb for not realizing it sooner)