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Not sure if Kucoin is going to fight it out or just leave US and it's customers. And then again, the one being affected here is US based customers but this is what their government is doing and so they don't have any options now or at least their options are getting small to trade crypto.
They are probably looking at the cost of going to trial and the likelihood of losing the case but I think they will end up settling. Kucoin management is likely guilty of allowing US customers to trade in their exchange. I doubt that the prosecutors are going to pull the trigger without strong evidence.