The Free Software movement is about helping each other to use computers in a way that strenghten our freedom. It is of utmost importance that children understand what is at stake here!
https://fsfe.org/activities/ada-zangemann/ by Matthias Kirchner does a very good job at it.
I read the book to my 10yo and she enjoyed it a lot! She now feels as strong about free software than about ecology, which says a lot.