Personally, I'm leaving my comments intact because I doubt that Spez is really going to benefit much from them in the long run anyway.The technology behind AIs currently seems to be moving away from simply throwing vast amounts of data into the training to a more precisely fine-tuned high-quality training dataset, so there's probably not going to be as much demand for Reddit's trove as Spez thinks.
And besides, the old PushShift archives are still floating around. We don't know how the legal or technical situation will shake out but maybe people will be able to use that for free training.