Why ask people to stay off smartphone and/or social media for, say a few months?

Who can do that? Why challenge people to stay off smartphone and/or social media for, say a year? How are people going to be informed about all kinds of very important things? In the bottled water company’s case (in the news last week $100,000 prize) you can use a laptop, desktop. But can’t people do all the time wasting things on laptops?
Aren’t lie detectors unreliable? Maybe that’s another story.
https://www.cnbc.com/2018/12/13/vitaminwater-offers-100000-to-stay-off-smartphones-for-a-year.html

Edited.