This is the Golden Rule, and it is what reciprocity is about. What I do to you, you can do to me, and vice versa. We can see at once that pyramids unbalance reciprocity. Whenever we see people interacting, we can ask is reciprocity promoted, or is it hindered. And so on.
Reciprocity is clearly a crucial issue in any debate on privacy.
So, unlike many other ethical slogans, it isn't just a sophisticated name for a prejudice so much as a universal way of looking at situations and highlighting ethical issues. It is about fairness, and most people would like to promote it. Let's turn from the human side of pyramids to the computers they are made of, for computers are much more than passive building blocks. Rather like idolatry does. Idolatry is where, instead of worshipping God, we worship some false god, something that is not a god at all.