Earlier quoted context omitted.
Of course the trained models, being derived from GPL code, become derivative work, and by extension - also GPL? Right?
No, you can't copyright an idea, only an expression of an idea, and LLMs operate at the level of ideas. They don't literally stitch together code from training.
If you imagine it as a "box" you feed into it material and a prompt and it spits out the same material rearranged to do what you did ask for. It does nothing more than a permutation of their input data, as does any computer program, of course in extremely complex and obscure way, but if you reason it abstractly it's the same things Turing theorized almost a century years ago, input -> BOX -> output.
So *of course* the output *is* a derived work of the input, and thus a GPL code should not really used as a training set.