It works pretty well for young age ranges, especially in the 'time limits' and other more objective controls. You have the bias of the average HNer who is into

It works pretty well for young age ranges, especially in the 'time limits' and other more objective controls. You have the bias of the average HNer who is into computers and was into them since they were children. There is also a good chunk of kids that just wont bother and go do something else, like read a book or play with sibilings. And a partial low labor solution is better than no solution or a high labor one that takes time from other higher value things for the parents.