It isn't inherently addictive. Gambling addiction is significantly less common than alcohol addiction, and has no properties that make it inherently addictive to someone who is not predisposed towards that addiction (unlike drugs, for example, which are inherently addictive to all humans).
Some slot machines/casino games are designed to appeal to problem gamblers. DK and co, however, do not design these games, and state regulators do already control aspects of their design. For online operators, this doesn't represent most of their revenue and, I suspect, most would be quite happy not to provide these products.
Gambling is absolutely inherently addictive as it's essentially perfectly paired with your brains reward system and hijacks it. There's literally dopamine cycle and tolerance happening. And when compounded by algorithms and notifications which are designed to amplify this even further I'm not sure how you can think it's not inherently addictive.
> unlike drugs, for example, which are inherently addictive to all humans
Define "drugs". Alcohol is a drug. Most users aren't addicts. So is tobacco. Most users are addicts. Cannabis? More like alcohol than tobacco in terms of addictiveness.
There may be some selection bias. Smoking tobacco is an unpleasant sensation. There's no reason to do it other than the addiction and the effects on your brain chemistry afterwards. Whereas many alcoholic drinks taste great in their own right and would be consumed even if they had no chemical effects.
I suspect gambling is like alcohol or cannabis. Engaging in it affects brain chemistry. For some people that's addictive. Most people are able to enjoy the activity without being hooked.
The real number we want evaluate is "what percent of the revenue comes from people experiencing significant negative consequences from the product."
For alcohol that number is something like 2/3 revenue from the top 10% of drinkers, who drink an order of magnitude more than the decile below them. I doubt gambling is very different but if you have more info I'm happy to hear it.
Gambling is proven to be addictive in the same way many other things are, and the harm of severe addiction is comparable to that of the worst drugs. It's very common for severe gambling addicts to lose everything they have, to lose everything they love, to never psychologically recover, to kill themselves.
Addictions spontaneously can turn on. For me, it was age 27. To classify people as inherently susceptible vs not is not accurate
I've seen this "it only affects problem gamblers" thing so much that I suspect it's an intentional strategy to shift blame that takes advantage of people's natural tendency to believe the just world fallacy (bad things only happen to bad people).