What they aren't doing is treating the root cause of the problem: loneliness, listlessness, depression. These are problems of our society and they seem to be getting worse over time. We need to change this. We need to build real communities where people belong. We need to build relationships. We're not doing that though. We're becoming more and more atomized.
https://en.wikipedia.org/wiki/Addiction has a seemingly clear definition “Addiction is a brain disorder characterized by compulsive engagement in rewarding stimuli despite adverse consequences.”. Labeling it a brain disorder implies it must involve a biological process, and that, to some, implies it must include some physical or chemical stimulus.
However, that page also says “many scholars who study addiction argue that the brain disease model is incomplete and misleading”.
That Wikipedia page also says “The term addiction is misused frequently to refer to other compulsive behaviors or disorders, particularly dependence, in news media.“
So, the mainstream opinion seems to be that not all compulsive behaviors are addictions.
There's a similar thing with depression, where people will try discredit others by implying their depression isn't real because it hasn't been diagnosed and confirmed by a doctor. If you're really damn sad for a really long time, our word for that is depression. If medicine wants to use the same word to describe a similar-but-more-precise condition, they can feel free. But most of the time we're not talking in a medical context.
The idea that addiction only actually exists when there are physical withdrawal symptoms is just wrong, and it is a very harmful wrong belief.
I met the guy who runs that site a few years ago, and he's been able to help a lot of people with that. He was an ex-gaming addict himself and seemed really passionate about the subject.