[stickfigure]

This is foolishness. Your biggest risk is that your product will fail in the marketplace, not that for mysterious-and-unnamed-reasons you will suddenly have to migrate off the platform. As far as "control" goes - there is nothing about appengine that prevents you from running specialized application code in other parts of the cloud. But it's a pretty exotic need.

[wmalik]

I know a thing or two about App Engine too, and I disagree with you.