Anyone surprised by this is kidding themselves. Only a few countries have developed sophisticated cyberattack capabilities and even fewer are actually interested in China.
Plus, ever since China went around and started executing CIA operatives in China, the US has been operating rather blind with regards to China.
Russia, North Korea, Iran have no reason to launch cyberattacks on China. Neither does Israel, really (their capability is far more oriented towards, y'know, their immediate vicinity). We're left with the US and UK, but as we all know, the UK doesn't really have international power anymore and as a result has little reason to provoke China.