Walking away sounds easy on paper, like for gaming addicts. The articles about Facebook from the past come to mind where management was fully aware of the addiction factor, and in fact did everything to encourage people to stay on Facebook longer, including showing them "relevant" content and encouraging likes.
Maybe restrictions, similar to gambling could be put into effect? For instance, clearly stating the business intent of the site, requiring ID, limiting to certain hours,.. its sounds weird but it reflects how underregulated the internet is compared to other areas.
If such addiction is something that can be diagnosed via a reasonably rigorous procedure, then yes, we'll probably have to do something similar to other addictive things: age limits, clear warnings, maybe even independent ongoing testing of the effects. Compare to selling alcohol.
Is the potential risk of addiction related to why alcohol sale is regulated? Most rationales I've seen for preventing sale to minors relate to health effects and immediate intoxication effects (car crashes etc.) instead.
Don't get me wrong, I'd be thrilled if addictive potential was considered primary among reasons to consider regulating something. I'm just not sure it is.
Maybe restrictions, similar to gambling could be put into effect? For instance, clearly stating the business intent of the site, requiring ID, limiting to certain hours,.. its sounds weird but it reflects how underregulated the internet is compared to other areas.