One of the most important Snowden revelations was the way intelligence services circumvent bans on domestic surveillance.
Intelligence agency from country A spies on folks in country B. That is legal in country A.
Intelligence agency from country B spies on folks in country A. That is legal in country B.
One click of the mouse and they do a swap—so easy a chimp could do it.
The basic info on that arrangement was out there well before Snowden.