[saulrh]

If you're calling a B average at a nationally-ranked EE/CS program, plus an internship, "insufficient", then, bluntly, their behavior is probably an attempt to escape from the pressure that your expectations put them under. Roblox is not that engaging, as games go; the only way someone can be attached to it for 12 hours a day is if everything else in their life is worse.

So one thing to do is to ask yourself: Why would they dislike their internship and so much? Did they want that internship with that company? Are they doing a degree that matches their interests, or are they doing it because it's "good for their future"? I'd ask if they have any hobbies, but clearly they don't have any that you recognize as such, so instead I'll ask if you've ever prevented them from pursuing a hobby because it was a "distraction" or "expensive" or it "wouldn't get them a job". I'm not saying that you're necessarily wrong about, say, teaching history not being stable employment, but I am saying that maybe they'd be throwing themselves into a performing arts or english degree in a way that they aren't engaged with an engineering degree. And why are they living in your house while doing a degree and internship, anyway? Have you "known" where they were going to go to school long enough to have moved there years ago, or did you move to follow them when they selected a school? Would they be hanging out with their friends in the evening if they lived in the dorms?

Whatever comes out of that, be very careful how you talk to them about it. It'd be all too easy for them to repeat back what you've been pushing at them their entire life, reinforcing the stresses that they're seeking to escape. Get them a counselor or therapist and then guarantee them the privacy they need to discuss their problems honestly and openly with that counselor or therapist, without you hovering over them. Like. Leave and go grocery shopping during their appointment. And whatever you do, don't cut off the video games; if they weren't gaming right now, they'd probably be doing drugs or joining a gang or the like.

Source: I internalized expectations from my parents and mentors that were not realistic or healthy and have struggled with them my entire adult life. I find myself using video games to escape from stress and burnout.