> So what is it about GPL licensed software that you feel would make AI training on it not subject to the same copyright and fair use considerations that apply to books?
The poster doesn't like it, so it's different. Most of the "legal analysis" and "foregone conclusions" in these types of discussions are vibes dressed up as objective declarations.
You seem like the type of person that will believe anything as long as someone cites a case without looking into it. Bartz v Anthropic only looked at books, and there was still a 1.5 billion settlement that Anthropic paid out because it got those books from LibGen / Anna's Archive, and the ruling also said that the data has to be acquired "legitimately".
Whether data acquired from a licence that specifically forbids building a derivative work without also releasing that derivative under the same licence counts as a legitimate data gathering operation is anyone's guess, as those specific circumstances are about as far from that prior case as they can be.