It was fairly widely known in the network engineering community in 2003/2004 that the "Echelon" system collected an extensive amount of domestic data for each of the five eyes, using legal dodges where a foreign agency (like GCHQ) would siphon american/canadian data and feed it to the NSA and CSE, and vice versa.
Those who knew how much the system had changed from satellite-intelligence gathering (from the era prior to transatlantic/transpacific submarine fiber, where most phone calls and international data were satellite based), to tapping fiber at submarine cable landing stations and "partnering" with major telcos, were totally unsurprised.