He probably has to delete his history every other day.
My first degree is in Telecommunication Engineering, which meant that I knew more about computers than most of my friends. This meant doing lots of computer fixing for a while, that then meant friends of friends’ friends would call me to install antivirus software in their computers for free. I got a bit fed up, so I started telling them that there might be something in their browsing history causing the problems and that I needed to check that.
Guess what? They soon stopped pestering me…