They're referred to as NEET (Not in Education, Employment, or Training) in the UK. As you mentioned, there's quite a few in countries like the US that don't leave their house often due to gaming addictions. I've seen many people on Steam showing north of 150 hours of games played in the last two weeks and I don't believe they're just leaving the game running.
A Palo Alto Networks NGFW has a category 'Media' which includes Video, snapchat, etc. Deny Media is quite effective against any form of behavior with a computer that supports NEET.
