Oh, come on. Surely we will make an exact replica (aka backup) of the portions we destroy *before* we do any experiments, no? I mean, if we can achieve a machine of N nodes, just wait 18 months and we can have one with N*2 nodes!
So, why not put the source code in git and let the OS download, compile, and install the updates from source [automagically]? Or maybe even have the entire operating system be an interpreter (a la BASIC, erlang, smalltalk or LISP machines).
It has nothing to do with whether the direct licensee is interested or disinterested in their freedom. The argument for GPL being 'more free' is that it forces the direct licensee to be at least as free as it has been to him.
The fees are quite low (on the order of a fraction of a percent [as opposed to 3-4% for VISA/MC or higher for Western Union). You can choose to submit transactions with no fees but depending on the load on the network and the amount of miners, difficulty of mining, etc, it can take quite a long time for them to clear. For instance, my zero-fee transaction from 2 weeks ago took a week to complete.