Well this is just... well, it's just plain stupid. It is clearly the fault of the MMO for being 'addictive' and not the person playing for sinking 90 hours into the game without breaks, great logic there 'researchers'. I mean I like MMO's, and when I find one I do like I play it pretty much during all my spare time during the day - SPARE time. Not the time I should be working or sleeping, just the time I have to spare (which is usually quite a bit, admittedly). I'm lucky in the aspect that end game grinding for loot bores the shit out of me, so I can never get really 'addicted' to an MMO, I tend to stop playing a few weeks after I hit max level and get semi-decent gear, but trying to stop people who do like that sort of content is just ridiculous. My friend used to raid several nights a week whilst keeping a full time job, it's the fault of the person (or that person's parents, depending on the age) if they get 'addicted' and spend unhealthy amounts of time playing an MMO.
I'm just going to leave and pretend I never read this now. It's just too ridiculous.