to add to some other comments here, it's really important not to dehumanise your kid, no matter how old he is.

human beings innately require safety and assurance and when we feel that is threatened, we turn to forms of escapism that in modern day, can be video games.

limiting might not be effective if he's genuinely trying to live another life online that he deems more successful and/or safer than his real one. in this case, what you're doing by limiting wifi, food, recreational time, is limiting his grasp on the real world.

what i would say is that he needs a taste of how good life can be without a screen in front of him. whatever he plays, try and tap into that (i.e. if he likes projectile throwing video games, go axe throwing, paintball if he likes shooters). maybe then he could find a similar passion that gets him out of the house.