Why would they want to destroy their creation, that makes no sense.

The NSA has a poor track record with cryptography, often being audacious enough to believe that their backdoors in common encryption standards wouldn't be found by anyone. So much so that the idea of them being behind Bitcoin at the same time that they were gutting modern encryption is... Well, laughable, really.

https://blog.cr.yp.to/20220805-nsa.html

Yeah you're probably right, definitely developed by a mystery man who just hasn't felt like cashing in the $50 billion from his wallet.