American companies can't dump. This is specifically for countries to protect their own industries.
US companies can operate at a loss to gain market share, but the money losses is still in its own economy and not an outside foreign country that might not aligned with our countries values.
Plus a company can only lose money for so long that eventually the market starts correcting itself and investors pull funding. Can't be said about China which is basically unlimited money.
The repercussions is drastic. China has already done this with solar panels. We are already beholden to them for this. If we were dependant on solar panels and not fossil fuel, they would literally be controlling our energy needs.