They hide malware in those systems to gain intelligence, they really don't need to install spies since they look different from other people. I think even those guys doing our roads have spies amongst them - to do reconnaisance and familiarize with the local population. In serious economies, the Huawei type are always given a though vetting (google around). Anyway, they built really cheap (and subsidized!) electronics, explains why everyone goes to China these days..
Some people call it the second colonisation;;
But most of us are happy that they are not giving us hundreds of hurdles like the americans do to get some loans;
It depends on the way you view it; here is an example: