The very concept of 'Economic espionage' is just an imaginary and totally fictitious line drawn arbitrarily in the sand, done so for no other purpose than to seperate what the US does and what China does.
If China made a breakthrough in fusion, stealth, supercomputing or any other field which gives China a huge leg up on the US tomorrow, and the US obtained that information. Who here thinks for even a second the US wouldn't pass that information on to private US commercial contractors, and demand they reverse engineer it to erase China's lead?
Even then the charge of economic espionage as the Americans define it rings hollow since even the mighty US espionge machine could not find a single example where any Chinese company has benefitted in any way from allegedly stolen US data.
It would not surprise me if this DOJ move was made for domestic political reasons, against the wishes of the likes of the White House and Pentagon, and America's national interest, as it has massively set back all areas of cooperation between China and the US, most notibly probably in the field of direct military-to-military links that the US has been so keen to foster.
Its all empty theatrics and petty posturing, and behaviour unbecoming of a great power, never mind the self-appointed leader of the world.