China's intelligence activity has long been one of the greatest threats to democracy. Salt Typhoon is a spectacular example of the proportions this has reached.
The USA's decision to stop investigating even before the leak is patched would have been unthinkable a decade ago. But as the USA confirms its transition to autocracy, its decision makes some sense. After all, as China is exporting its governance to the USA, it's only fair that in exchange, the USA exports the secrets and wealth it no longer deserves.