Imagine one day you open your wallet and discover that you've received 10,000 Bitcoin by mistake from a stranger. What would you do?
Obviously I find out who mistakenly sent it to me, and return it.
Otherwise I spend the rest of my life looking over my shoulder for taking half a billion dollars that I was not entitled to.Why did you immediately think that it came from some dark web overload? It could have come from someone who bought Bitcoin early; I mean, they also have that much.
Neither of those can track you down for at least two years and you can hide somewhere safe.