I don't know, the civil asset forfeiture laws are pretty broad, and there have already been cases where funds have been frozen, or even forfeited.

Even if it's not passed, the risk is still there it's just that it's smaller. If it does get passed, which I think it will, then the cat's out of th box.

Yes all major exchanges are from the US, and China already has capital controls and similar legislation, so no big exchange is safe.