I was recruited by a sports gambling company and went as far as interviewing with them. I really enjoyed the interview (interesting tech, really smart people) and I've placed a few bets along with friends before in the past without ill effect, so I did some quick checking about how gambling businesses make money. As far as I could tell, across different gambling businesses, the focus is on "whales" -- chronic gamblers who spend as much as they can or more on gambling. The public image of these "whales" is the immensely rich person who visits a casino a few weekends per year and casually loses a hundred million that they won't miss, but a lot of the "whales" are people like the ones in the article, middle class people who lose hundreds of thousands of dollars while desperately trying, and ultimately failing, to stop their addiction from ruining their lives.
Online gambling makes it profitable to pursue smaller and smaller whales, because you aren't limited by the amount of space inside your casino, or the number of people who live near or can afford to visit your casino. Your targets are everybody where you can legally operate, and you're running A/B tests and other optimization technology to increase an addictive behavior. I.e., their business model is to stoke a ruinous addiction across every social and economic class in every jurisdiction they can legally operate in.
Standard disclaimers: I'm not an expert, not an insider, not in the industry at all. Also, none of the information I learned was directly about the company I interviewed with. I'm just talking about my understanding of how gambling businesses work from what I could glean online.
Anyway, I didn't take that job.