Sure, I agree that I may not necessarily want to trust the organisations they trust or indeed mistrust the organisations they mistrust. Or to put it another way

Sure, I agree that I may not necessarily want to trust the organisations they trust or indeed mistrust the organisations they mistrust. Or to put it another way, my web of trust may differ from theirs. But the OP was for example talking about potentially wanting to "exclude Apple" which would, IMHO, be nonsensical on Apple's OS.