As a mum of five and soneone who has worked with troubled kids for most of my life, I am extremely interested in teen Internet/gaming addiction, I think it's a very real problem which needs looking at.
My dd is 13 and also cannot send regulate her Internet use so I have to remove devices at 9.
I tried dufferent options such as it charging in the room next door but she was up and down half the night checking on it 
We now have to have it in our room overnight.
I also managed to get her mates mums to do the same which helps.
She is otherwise a lovely girl, good at school with a huge talent for dance.
Her dance has suffered to the point that I pulled her out of a big competition as she was never ready for rehearsal or had her equipment ready.
At one point I thought I was going out if my mind with the stress of it.
The nightly stand off with her screaming at me like a maniac then both of us going to bed upset was destroying me.
Now she just accepts it and gives them over albeit reluctantly.
I know you feel bad and that you are ruining his social life by removing it but you have to do something don't you?
From the point of view of addiction, try to help him stay busy, I don't know how, maybe take him out, let him have mates over.
Do you plan to re introduce it at a later date?
Dh knows adults who are like this,
One guy used to go to bed with his wife thrn sneak back down to game all night! His wife left him for another man.
Good luck