They're a great example of the unintended consequences of regulation. I'm sure the original intent was not to have a huge banner where the options for managing what the site tracks were a one click "sure, whatever" or a multi-stage process of "no -> manage preferences -> categories -> reject all -> find the actual 'save' button, not the 'enable and save' one -> confirmation page where 'cancel' is lined up in the same place as 'save' was previously".