Bingo. I’ve always thought it was the NSA, CIA, or maybe UK or Israel but I doubt the latter two. Especially since Satoshi’s wallet is so large and hasn’t moved.
Bitcoin has to make it much easier for 3 letter type agencies to follow money.
Unfortunately it's almost definitely a smart nerd (using this as a compliment here) who passed away.
Most darknet stuff uses monero and that is... tricky to follow.