How are backdoors used by governments/companys?

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Hardware backdoor as a security threat?

My potential adversary is a totalitarian regime with OEM under their control, and possible physical confiscation of my devices. What are the steps I should take to mitigate the existence of hardware backdoor (e.g., malicious chip planted in in the manufacturing process of my keyboard)? All I can think of: (1) get my devices from vendors further away from regime’s sphere of influence, (2) Use 2FA in a separate device, everywhere. Anything else? I realize that if hardware backdoor were to exis…