Video game addiction advice?

I’m feeling so disillusioned by how dismissed I’ve been trying to get help from therapists about my son’s video gaming addiction. Does the world of psychology not take it seriously as an addiction? For years he’s been living a sort of virtual life that makes his real life painful in comparison. He’s watching his friends graduate from college, get jobs, get married and comparing himself causes deep feelings of shame that he escapes from by using the games more. He’s doing little else but playing video games. He loses sleep, has dark under eye circles and is pale. He doesn’t care about work, school or building a future for himself. I’ve been trying to get help from therapists for years about it. It started when he was a teenager and the first therapist I took him to who was a specialist in addiction laughed when I said the addiction was to gaming. I know it’s not heroin, but it’s genuinely destroying his life. He saw two therapists after that and they didn’t talk about the gaming in session because he won’t acknowledge that it’s an addiction. The third one said if I take his coping mechanism, he might lose hope with coping. He saw him for a year and nothing improved. He doesn’t think he’s addicted when it’s obvious to me and everyone in the family that he is. It’s damaging his mental health. I feel so powerless and I don’t know what to do. Does anyone have any good advice?