My reading of USA law is that if CK coins were obtained at any time by USA citizens or residents as investment securities from some controlling entity, then plausibly the SEC (if it has the cooperation of the other nations) can prosecute the controlling entity and take actions to shut down the coin, such as declare running the protocol to trade the illegally produced securities an illegal act.
Maybe find a way to prevent US citizens from accessing the coin? It's just 5% of the earth population, as we see it's Asia that influences cryptoindustry, not USA.