“In these circumstances, we would expect every economy to welcome cloud services without regard to the national origin of their producers. But there are complications. One of the big ones is the limitations on trans-border data flows . . . [i]t is very important, however, that we not unnecessarily sacrifice the economic advantages inherent in cloud computing in our arrangements to protect personal privacy. Stated more directly, we should not let our quest for effective privacy mechanisms become a barrier to international trade in cloud services.”