rish3 - 9:08 pm on May 5, 2013 (gmt 0)
Heh. It doesn't matter if the AppSpot proxies are "caching" the pages or not. They are serving them up as if they exist locally...and worse than that, they've altered the html such that all linked on served pages look as if they are on the AppSpot domain as well.
You can bet that if anyone started serving up Google's own content on one of these AppSpot domains, the app would get banned.