But what if Satoshi Nakamoto was actually the CIA or NSA (which explains why no one has been able to find who he/she/they really was)?
So what if satoshi is the NSA? Bitcoin is open-source and probably one of the most scrutinized software projects on the internet. By the way, he is probably not the NSA, just one of the popular cryptographer suspects.
That's the thing, you can't stay anonymous on the internet forever when you are using the internet infrastructure and domains which are controlled by the gov.
"Forever" is a very long time. You can stay anonymous for a reasonable time. Fire up Tails OS and use Monero as p2p e-cash. Pretty good anonymity. Just don't mess it up by linking your real world identity.