When the coins were only worth a few million he could've cashed out then but now he's just in for permanent trouble.
In my opinion, there was a real (but vague) clue to his identity that was not a red herring: the IP leak in the debug logs he sent to Hal Finney. He used Tor most of the time but briefly slipped up and likely divulged his real, residential IP address. If that's the case, then he was living in California, possibly around the LA area, as of January 2009.
https://whoissatoshi.wordpress.com/2016/02/20/satoshi-in-cal...
Or, if the creator died of ALS.
The NSA couldn't even keep their data sniffing secret, the odds that they could keep the billion-dollar Bitcoin secret are not good (according to the theory above). There are more viable theories about Satoshi's identity and why/how he disappeared completely imho (eg Hal Finney). The paper and the name prove next to nothing, it's maybe a hint that one of the the creators might have had a US security clearance at some point.
If you dig through all of his forum posts, emails, and code, it's entirely consistent with a solo dev reading a bunch of papers, combining ideas (digital currency + hashcash), iterating on some software, and interacting with his community.
I don't understand this. What does the NSA get out of it? Developing it to study cryptography? Why not, but then why release it publicly? The fact that Bitcoin didn't replace fiat currency is something we know now, but recall that it was considered a possibility at the time. In the end, it just cost a lot of people a lot of money. Say what you want about the NSA, I don't think they would create something with a huge downside and no upside for them into the public for shits and giggles.
A transparent ledger which is easy to audit, for the purpose of catching cybercriminals.
Pushes entities of interest towards using this new currency as part of sanctions evasion.
Creates downstream effects in tech for expanding the technology. Promising parts can be used to obtain budget for things that are even more off the books.
To this day one of the more prominent use cases of bitcoin/cryptocurrencies has been to turn USD into sanctioned currencies.
Sophisticated criminals who actually are interested in targeting you can play your shell game until they figure out who you are.