There's more than a decade between me and my siblings (brother's 21 and sis's 17). DB has been basically living in an online world for a few years now. Lots of tearful phone calls from my mum, screaming both ways, therapy for him, ultimatums from my mum, nothing works.
First year of uni, he would stay up till 6am playing video games and watching Twitch and would miss classes. Pandemic started, he failed all his modules, and decided to take a break. The problem now is that he is only 'looking' for WfH jobs and is spending all day playing video games. My mum calls me all the time at a loss because he's constantly rude to everyone, last week my sister was getting ready to go out with her boyfriend and he was making jokes about her dating a 'beta manlet' (direct quote from her).
Living with me to give him a so-called fresh environment is not a solution. A colleague of mine's late-teens son also chooses to spend all day online and refuses to do anything but online uni or online jobs, and I know of another friend who has a brother in his late-20s who have been doing the same for the past 10 years so it's not that uncommon, but what do you even do here?