And yet, if you played Cow Clicker, even just once, I got enough of your personal data that, for years, I could have assembled a reasonably sophisticated profile of your interests and behavior. I might still be able to; all the data is still there, stored on my private server, where Cow Clicker is still running, allowing players to keep clicking where a cow once stood, before my caprice raptured them into the digital void.
Much more, here.