You have a very wise attitude to these things, that you should keep. But an indication of scale might be useful.

The Thing is rightly legendary in real life spy shenanigans, and a dramatic example of hiding things in plain sight.

https://yandex.com/turbo/en.wikipedia.org/s/wiki/The_Thing_(listening_device)

During the course of the operation, it was only handled by a few people, none of whom had much technical knowledge, and then it sat on a shelf.

Tor is made of transparent digital code instead of opaque wood, it has been handled daily by experts around the globe, and there are literally tens of millions of copies.

Finding out there was a back door all along would be like finding out every Toyota Corolla has a "Decepticon" form and no mechanic ever noticed until one day they rose up and took over the world.

I, for one, will welcome our new robotic overlords, and I have always treated my Toyota with kindness and respect. I don't lose sleep over it, though.