Can't say I'm happy about the idea that this API will encourage more made-for-adsense sites however Y! is easy to scrape. I don't have monitoring tools that scrape Y! and report ranking results because that would be unauthorized use...but if I did, I would not rewrite them to use this API. Google is hard to scrape so it makes sense that they could be critisized for releasing an API. But anywho, I'm happy to see Y! catching up to Google and leveling the playing field a bit more.
how do you figure one is more difficult to scrape than the other?