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You may have missed when they jacked up AppEngine prices. It was fine for a lot of people already making significant money with their app but it basically killed my app (would have been unjustifiably expensive to keep running). I won't be trying proprietary google infrastructure again anytime soon.

In my experience as a GAE customer, I was surprised at how much they didn't seem to care.

A clear sunsetting roadmap still means that you trusted your business to something Google no longer cares about. It doesn't protect you from the cost of migration.