To the people arguing it's "fair use" to use this for training an ML network. Where do you draw the line? What if you train an "ML network" with one or two inputs... so that they almost always "generate" exact copies of the inputs? Five inputs..? Ten? A thousand? A million?
There's absolutely nothing different whether the creator is ML or a human.
Generally, if you train an ML network to generate an almost exact copy of a thousand lines, it's obviously not fair use. If it's five simple lines, it obviously is fair use. If it's somewhere in between, there are a lot of different factors that need to be weighed in a fair use decision, which you can easily look up.