On the contrary, the model doesn't actually add any lock-in. When GP wants to switch to free model the config files are still there. There's no lock-in, as I see it.
It is not about lock-in, it is about free software being usable without resorting to non-free software. One of the free models is usable for this would be a better shift and that might be workable but I'm not sure about how well they'd work.
