(vi) 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;
...
I guess they don't want people to build GPS-based applications that constanly calls the Yahoo API to plot the points on a map, which is fair because an automated system like that could overwhelm Yahoo's servers.
Now, how about your super-modern digital camera with GPS and WiFi, where you take a picture and instanly upload it to Flickr? I guess that picture can't appear on the Flickr's map until 6 hours later.
Oh, stupid me, Flickr is owned by Yahoo, so I guess they have an exception.