IIRC, Snowden has yet to be formally charged for treason; "we" didn't label or charge him for that, that's a gross generalization. I know what you mean, but you might want to tweak that wording a bit.
He was charged under the Espionage Act of 1917, so it's spying, not treason as defined by the US Constitution (he hasn't levied war or adhered to an enemy, but it is possible to argue that he's provided aid to an enemy through the leaks).