>I don't think anyone is surprised

I do. Nobody who goes on HN will be. But the layman who spends 80 hours a week working a minimum wage job who has no time for computers and just wants a Disney vacation for his kids, absolutely would be floored by this. It seems very reasonable to apply conventional logic to computers. You can write all you want on a piece of paper and then throw it away and nobody would see it. The same doesn't apply on the internet, but it's not a big leap for people who barely know how to log in.