> should the start-ups - which rely heavily on user addiction - be treated as gambling outlets, and therefore be regulated and watched closely?
No, definitely not.
You might as well outlaw television for entertainment and the writing of fiction and poetry.
Everybody gets to decide how they spend their time, that's an individuals freedom, and every company gets to decide what product they want to make.
In the past companies have worked hard to give us more productivity and therefore more leisure time. New companies have stepped up that capitalize on that leisure time.
The times when people had to be productive (in the developed part of the world, that is) every waking hour is fortunately behind us, and bringing it back by force is not a solution.
For ever addict there are 100's or even 1000's of 'normal' users of those same services, you can't penalize everybody because of an inability for self-control in a minority of the population.
"Facebook" or "Wow" or any other so called addictive product is only as addictive as you let it be.