I think the problem has been to this point the way that they gather and use the information, and of course the “privacy” issue.
Of course they have all found ways to get around it…MSN uses their free hotmail, google uses the toolbar and so on.
I think it has legal considerations up until recently.
Google has gone so far as to mention using their db’s for AI (Artificial Intelligence) integration into their algorithms.
All very curios.
You can go to prison for sending an unsolicited email, but someone can collect your every keystroke, apply biometrics, and serve up what they decide…or in Google’s case, where they can squeeze more profits from.
GaryTheScubaGuy