If your data (or at least data about you) is everywhere, there's only one thing left to do. You'll have to engage in a misinformation campaign about yourself. Send advertisers so much conflicting information about yourself that they can't distinguish the signal from the noise. That way they won't be able to target you.

This may sound ludicrous, but there actually is a browser plugin out there (I don't have a link handy, unfortunately) that confounds meaningful tracking efforts by clicking on each and every ad on every page you view. The pages the ads link to aren't actually displayed to you.

Like I said, it's a crazy tactic but it makes perfect sense. Overwhelm them with data.

Google strongly opposes it, by the way. So it must be on the right track.