That's a good point, and not one that I've considered particularly deeply to be honest. (I'd love to hear other people's point of view on the topic!) I guess in many ways the situation is similar to that around adblock. Ultimately, the links that are overlaid on a particular page should be solely and completely under the control of the user. If the technology that everyone is using permits this kind of behaviour, I'm not sure companies have much choice in the matter.