Or by adding value. I believe Y! still unofficially ignore the scraping of our address books because it was adding value to our users even though the services

Or by adding value. I believe Y! still unofficially ignore the scraping of our address books because it was adding value to our users even though the services that did it broke our Ts&Cs and used the username/password anti-pattern. In the future I think it will be more likely that we'll clamp down on that stuff because there is OAuth to authenticate with. However the main point is because it added value to our users we let the scrapers get away with it.