>"No one else can look at it without your permission, it can never show you ads.": These are only possible if it has no visual display or interface at all, or i

>"No one else can look at it without your permission, it can never show you ads.": These are only possible if it has no visual display or interface at all, or if it's so limited as to be useless. I think this is in contrast to Windows being the most popular OS in the world, an OS which does show you ads.