Given CXMT doesn’t just up their prices after gaining market share too.
They might eventually, but certainly not immediately. In the process they are going to force the other big players to lower their prices to compete.
Also China can just ban the export, or tariff it.
I don’t think China has ever banned an export. It’s pretty rare to tariff an export, basically only happens when it’s a limited good that the government wants to ensure a local supply of. I think the only country I’ve heard of doing that is Greenland due to some british wankery.