Even the USA as the largest economic market in the world couldn't kill crypto by seizing assets as there are dozens of other countries that will keep using crypto for the anti-corruption, stability, and efficiency benefits it provides. It's a lot like the internet where a country can ban or control it but ultimately it only harms their own citizens and prevents them from properly competing on the world stage.
If a criminal steals my bitcoin and spends it, everyone who accepts it and everyone who accepts it from them is taking delivery of stolen property, trivially traceable back to me. I'll want it back, because it is mine and was stolen.
https://en.wikipedia.org/wiki/Possession_of_stolen_goods
As a practical matter, if crypto continues to gain adoption, law must emerge to keep the ecosystem from getting jammed up.
And local and State government. https://www.nyc.gov/site/nypd/services/vehicles-property/pol...
USA is sovereign and does not respect international agreements.