How about applying some (survivorship?) bias here?
Smartphones and the internet make access to knowledge easier for everyone, but that is a small amount of what is otherwise cluttered with mostly useless(and sometimes damaging content), which naturally, appeal to the larger part of the population.
However, if having access to a smartphone can help some kids learn a little bit more, or maybe change someone's life by just making it easier to browse useful content, isn't it worth it? Those who won't find a good use for a phone would just have some other silly pastime if phones didn't exist.
I say just let people play candy crush, maybe while they are waiting for a life reload they might learn something on the tiny screen.