Recently it was uncovered that some server boards by SuperMicro manufactured in China had a mysterious chip that was studied and found to implement secret monitoring of all network traffic processed on-board at the hardware level. These boards are quality high performance boards which are low priced and widely purchased for large server farms, corporate and government networks. Google, Amazon and several others issued statements that their SuperMicro boards were OK. Then it all went very silent. The point is that Chinese have incorporated technology to spy in products that their manufacturers sell (tech passed to them to support their manufacturing for others). I see the same risk for 5G networks. Hardware based espionage is much more difficult to discover than software based espionage.