Meh, if there is a backdoor it will be used, a warranty is a nicety and not required when the government steps in, including the US government. They break the law all the time, as was indicated by PRISM and numerous other illegal surveillance processes. All governments do it, it's just that China is turning it into an art form and flagrantly doing it and letting us all know they are building up a database on their own people to decide whether they are good people or not. Blocking Huawei is strictly to protect the USA's military interests, it's not about privacy. Cisco and Qualcomm may build in back doors but they are the USA sanctioned backdoors. That why Big H is getting the boot during 5G rollout