Bitcoin was designed by an individual with intimate knowledge of the state of the art in
suspicions of NSA backdoors.
You are assuming Satoshi is sitting on money. Satoshi took care to hide it’s identity, and thus would have switched mining to different addresses very early in bitcoins history.
It would have been obvious to Satoshi that spending from a known address would blow it’s identity, so only did so for testing.
Satoshi may well be a billionaire and spending bitcoin every day.
People seem to take comfort in this idea that bitcoin was created by a government... because bitcoin seems radical when you first learn about it. However the attempts to create it date back a couple decades before it was created. Satoshi combined existing inventions with just the new element of his time chain.
But even if the NSA were behind it, what could they do? Anything they could do could also be done by someone with a math breakthrough. So whether the attacker is the NSA or not bitcoin has to be robust against it.
So where is bitcoin vulnerable?
It’s easy to imagine vulnerabilities in the cryptography, but hard to produce them.
Further, if you did, it doesn’t necessarily affect bitcoin. This is bitcoin’s genius. It’s not software, it’s a set of incentives. Show an error in the software, it will be patched and bitcoin will carry on. Worst case is a hard fork.