My view is that the cyber threat is bigger than any one government agency - or even the government itself. But the FBI brings a rare combination of scope and scale, experience, and tools to the mix. We investigate criminal activity like intrusions and cyber attacks, but we also investigate national security threats like foreign influence.
Some people are skeptical about the value of indictments where a foreign nation-state actor is involved. But in the case of APT10, the indictments marked an important step in publicly exposing China's continued practice of stealing intellectual property to give Chinese firms an unfair advantage in the marketplace.
China has national security laws that compel Chinese companies to provide the government with information and access at their government's request. And virtually all Chinese companies of any size are required to have Communist Party 'cells' inside them, to make sure the companies stay in line with the party's principles and policies.