>No idea whether this is FSF's official stand but in a talk[0] Richard Stallman said that the training data is not relevant as long as the network can be tweaked by retraining, i.e. the weights are licesenced so that modifications are allowed.
Is this even practically possible? How do you re-train a blob you know nothing about? To me this sounds similar to saying a compiled binary is free software if the license allows you to decompile it and deobfuscate it.