Well there is evidence that Chinese spied on African Union's members through the servers they installed. Tangential, i know, but would it be that crazy to expect them to do the same if they had full access to a 5G network without fear being caught? Especially with US or EU were the secrets they would be able to gather would be far greater. I mean I trust the Chinese less than US on their espionage standards, yet US still spies on its allies and enemies.
https://qz.com/africa/1192493/china-spied-on-african-union-h...