If NSA opsec was such that an outlier like Snowden, ideologically motivated and willing to up sticks and lose a career and a nice untroubled life, could access

If NSA opsec was such that an outlier like Snowden, ideologically motivated and willing to up sticks and lose a career and a nice untroubled life, could access and deliver detailed information on backdoors (we haven't seen any specifics, but indications seem to be that they are likely in the docs Snowden lifted) and cover his tracks, then it seems at least worth considering that "normal" spies, where the motivation is money, sometimes blackmail, who will stay in place or exit gracefully, have already delivered similar information to parties with the means to procure such, including the ones you list; so they might not need to brute-force anything.