Well, but we can assume with different probabilities. For sure there are people in every government who would if they could, but the fact that the US has mechanisms to expose this sort of thing and lots of people in individual companies who feel like you and there are still no stories of this, that is evidence that it isn't happening at least not at any sort of scale
Not the point.
The point of my comment is: I assume any gov to have such backdoor if they can.