Azure has different privacy agreements set up with different datacenters as mentioned in this footnote
Azure is now available in China through a unique partnership between Microsoft and 21Vianet, one of the country’s largest Internet providers. (https://www.azure.cn/)
In Germany, Azure will be available via a new data trustee model whereby customer data remains in Germany under control of T-Systems, a Deutsche Telekom company, acting as the German data trustee.
In addition there are presumably different regulations for hosting in a UK based datacenter vs one in the US
What are the privacy differences with Azure trustee delegates in China, Germany, and the GA offering?
Would it ever make sense for a US based person to leverage a German (or other) datacenter for production use?
Should I assume the lowest common denominator of privacy when two different datacenters interact with each other?
What would guide a US based person to opt in, or opt out of a given datacenter?