[yarrel]

This is a misunderstanding of the concept of "trusted third parties".

Incredibly, yes, you have to rely on the software that you use to perform tasks to perform them. But this is not the same as placing another person in a mediating position where they can choose to betray you.

Confusing these two senses of "trust" results in an intuitively appealing but entirely mistaken family of arguments that aren't the gotchas people think they are.

The Very Short Introduction book on Trust covers different senses of the concept of "trust", including the ones I mention here, in a readable and compact way that I highly recommend.