I'd love to see some kind of pre-populated sample account to play around in. My willingness to test out an app has an inverse relationship to the number of forms that app asks me to complete to view its functionality. In this case, i felt like there were quite a few forms that I needed to fill out to get to the charts.
Beyond that feedback, I think this looks really interesting and would love to see where it goes.
I think the points about people voluntarily building their businesses on Google's platform, and being thus beholden to Google's whims are well-made. The law, as it exists, doesn't seem to prevent that kind of thing since they're all private businesses, and this behavior benefits the consumer (arguably) even if it does hurt other businesses. Antitrust law (in the US) seems ill-prepared for the 21st century.
I tend to get interested in the policy concerns. Is web search so important that it should be considered a public utility, and thus regulated by the government? I think there's a case to be made there.