Maybe the NSA just needs to develop the best, most secure anonymizers and invite people to use them... or maybe they already have < /conspiracy mode>
Tor / "onion routing" anonymizing network was actually originally developed by NRL/Navy and NSA (and funded by CIA, DoD and some other agencies) for use in the field by CIA, Navy, DIA, FBI and some state police investigative branches.
CSpace and ZRTP are simply encrypted IMS and Real Time Protocol based mostly on enhanced public-private key exchange protocols, first implemented in free open-sourced PGP by Phil Zimmerman.