My guess: it's used as a high quality source of training data (well, mostly anyways) since papers like Textbooks Is All You Need showed that that can be a treas

My guess: it's used as a high quality source of training data (well, mostly anyways) since papers like Textbooks Is All You Need showed that that can be a treasure troth. Offering this as a "public service" may just be a smokescreen for regulators.