If Google had said from the beginning that their pricing was discounted for the preview, I would not have had a problem with this. But given that they didn't communicate this and that the cost of switching platforms is high, this feels more like a bait and switch tactic.

My cost is only increasing about 4x, but others in this thread are seeing 20-100x increases. Changes like this impact more than GAE -- this will make me hesitant to use any platform that I can't easily migrate away from.