Because unless you go collect some sand and make your own wafers etc. you have to put some trust somewhere. I trust a relationship between me and a manufacturer

Because unless you go collect some sand and make your own wafers etc. you have to put some trust somewhere. I trust a relationship between me and a manufacturer of choice more than an adversary. Keep in mind that trust does not equal blind trust. I trust an Apple SoC and Apple SEP more than say, a RockChip SoC or a MediaTek SEP. And I trust a finger print reader that does not transmit actual fingerprints to the application processor more than a finger print reader that does. If you are really on the spectrum of 'trust nobody', then what are you doing here on the internet? You had to trust your GPU, your window manager, your browser, the network stack, your internet provider, the server this site runs on, the people who own it etc.