Earlier quoted context omitted.
Could the reason be that the US and the others have different access to the companies? The US was caught when somebody blew the whistle, just Google for PRISM, for example. China and others could not have done that, therefore they would do something else. They make and ship hardware, therefore their vector of attack would be expected to be that hardware. Unlike the US though, I am not aware of any substantial attack…
Saying US has been proven and not Chinese is the real propaganda. China has been caught countless times. Anyone working in network security or Telecom have their China story It is no longer treated with fanfare because unlike US it's is almost common.
I have no doubt that China or Saudi Arabia or Russia and so on have spying programs and there were cases of revealed moles installed in companies but it's nowhere nearly as substantial as US directly plugging into the systems that run globally and running mass surveillance programs.
Google for Wikileaks, Snowden. Assange. The results will surprise you.
All this debacle looks nothing more than the US not wanting competition. It doesn't even look like the Chinese mass spying efforts are beyond a startup stage when the US spying is equivalent of a giant and established corporation. Actually, not even a startup, more like mom and pop shops of spying.
I think it's alright, US is no longer the country that stands for something beyond nationalism and most of the Western nations are not covered by that American Nationalism.