Freedom to give your feedom away. Freedom to know it.
If you really have freedom, you can give it away for your personal choice. And you are free to want it back at any time.
With free software it's possible to find out freedom violations. To follow your example, if your firewall were closed sourced one guy after you could hardly found out if your program violates something or not.
Surrender: technic is not natural nor neutral.
Free software limits the possibilities that someone use technics to limit someone's freedom.
Have a good day,