Darkcoin is nothing to do with Tor.
Tor is an NSA funded honeypot, last year they supplied >60% of the Tor Project funding. This is openly and publically verifiable. Common sense suggests that they also run most of the Tor exit nodes. Tor is also slow, unreliable, and a pain in the arse to use.
Darkcoin/DS+/DarkTransit will be much faster, much easier to use, and not owned by the spooks.
Subversive technologies are useful to the US Intelligence for subverting foreign governments or conducting operations in other countries. For example, chinese, iranians, etc using TOR to surf foreign websites, bypassing government control. So the US has an interest in funding such tech.
Almost no government (except the USA) has NSA-level capabilities to break / honeypot / guesstimate with high probabilities systems like TOR, anonymous cryptos etc... So they are quite useful in the rest of the planet.
NSA-proofing is the last layer so that you can also be safe vs the US government surveillance.