> Hardware fabrication is a capital intensive industry, and capital intensive industries are pretty vulnerable to coercion by the governments in which all their capital equipment sits.

If the spec is open then it should be possible for a fancy lab to verify that the hardware is manufactured to spec, right? So if you have it manufactured in Taiwan but then have random samples verified by labs in the US, Japan and Europe, defectors could be detected. Then the manufacturer would have to risk destroying their business by getting caught inserting a backdoor.