MTBGuru blog

You may be wondering why we chose to use Google Maps instead of, say Yahoo! Maps. Not because of fanboyism, though we really do like a lot of Google’s stuff, Earth in particular. But Yahoo! Maps has been getting good press (as has AskCity, but they don’t seem to offer an API).
Technically, both map tools are practically clones, Ajax and all, and there are good developer API’s available for both. So what made the difference? In our FAQ we mention that Google Maps’ Terms of Use are less restrictive. Let’s clarify this a bit: when you’re thinking of creating a GPS mapping site and you’re reading Yahoo! Maps API Terms of Use what are you supposed to think when you stumble upon Article 1.f.(vi):

(vi) YOU SHALL NOT: use the Yahoo! Maps APIs with location information that is less than 6 hours old and derived from a GPS device or any other location sensing device;

Indeed, this alone was reason enough to not even consider Yahoo! Maps. What are they thinking - afraid that people will build stalker websites to track other people? A Homeland Security type measure? And there are more examples.