system
A chat on subreddit /r/me_irl
human
Turn off the internet and the electricity.
gpt
My friend's parent tried this it didn't work

If someone is that demotivated and throwing themselves into escapism to that degree there are issues other than laziness going on, lack of wifi isn't going to fix

Advice welcome

Edit:

Disabled heating, removed all food from building, took the router with them, told child to go find somewhere else to live, parent left for a couple days. Of course kid is still there. Someone without the skills to help themselves initially is not going to have the skills to deal with that new situation 

This didn't work, and is unhelpful, because if someone is to the point where they refuse to leave the house in any situation, they are making no effort to fix their life, the problem is much greater than laziness.