Nobody is denying the freedom for commercial use is a core part of open source software. However no developer has to make a certain business model easy for you, and I think it is well within the correct view to discourage such a business practice which restricts the freedom of users by making that impossible but allowing a "competitor" (if we really must think of it this way) to generate "economic value" (i.e selling open source software, which the GPL does allow you to do).

The freedom debate is unending. Personally I am very skeptical of all forms of economic freedom, as frequently they have the result of pidgeonholing people and their freedom is restricted.