From a legal perspective, GMail is operated by one corporation which can have a single warrant issued, and be forced to reveal all of your emails, no matter how

From a legal perspective, GMail is operated by one corporation which can have a single warrant issued, and be forced to reveal all of your emails, no matter how many servers your account resides upon. Even if you do end-to-end encryption, they're still going to see who you're sending email to. With a more decentralized system that for instance does onion routing it might be possible to radically improve privacy.