[ihsw2]

Because the state-owned Chinese ODMs/OEMs have a comprehensive history of installing malware/spyware on devices branded for internal (Chinese consumer/commercial) consumption, and when the same devices are exported they may still have this malware/spyware.

The US insists on ensuring these devices are free of Chinese malware/spyware and this includes complete technical specifications (which also includes source code). The Chinese always tell them to pound sand and either buy their products or don't.

It should be noted that these devices are guaranteed to find their way around the world (usually via consumers bringing it on their person or exported to other regional markets) and they are frequently used (by multiple parties) for corporate data exfiltration. Then again the US intelligence agencies regularly practice this around the world as a matter of policy, utilizing their relationships with global cargo services to ensure their own malware/spyware finds its way around the globe.