Perhaps it’s churlish to mention, but... China was happy to ignore environmental standards in order to corner the market in rare earth minerals. American miners couldn’t compete because they were already “internalizing” the environmental costs, and were priced out of the market. Once China had put everyone else out of business (and blocked foreign businesses from mining inside China), it started not only reducing out…
I don’t think they are asking companies to help with their current cleanup. (That would expose them to similar claims in other countries which serve their industries).
But your major point is right that they were more than happy to dump rare earths to corner a market and are now suffering the consequences of that policy.