The FSF, while the license writer, is not the copyright owner, or the contracting party. Their view of what should/should not be a derivative work, listed some

The FSF, while the license writer, is not the copyright owner, or the contracting party. Their view of what should/should not be a derivative work, listed somewhere in an FAQ nobody here has probably read, would mean precisely nothing in court :) In fact, in the only US cases to have a say on the GPL and definition of derivative works, the FSF's view was never asked for or cared about.