We are seeing that with some rare earths, even tho china is back into exporting them (except to japan, I think?) everyone is looking for alternatives already. They may have killed their industry 10 years down the line for playing with the export lever a bit too much.
Just like how markets punish the ram cartel creating a chance for cxmt and ymtc to enter. It would create a chance for western companies to do the same if china messes with the markets they have "cornered".