Shame is that at many sites it’s not really opt-in. If you disagree, you get a lecture on why the site is obliged to track you and then you can accept anyway or leave. A cookie wall, if you will.

Examples:

* http://tweakers.net

* http://nos.nl

* http://uitzendinggemist.nl

NOS (public news broadcaster) and Uitzending Gemist (public television catch up) are interesting cases because apparently they’re actually required by law to collect user statistics.