How about things that aren’t quite facts? Reviews, opinions, etc.

Those cite the original source that they used to write the article, the gpt models don't.

Yeah but for every instance of that are face hugger links blogs that will rewrite the article and almost meant to deprive the source of any credit.

It’s not clear to me where the line is.

When it becomes a service where you make money but the source doesn’t is it still fair use?

Perhaps we will see the courts revisit this idea of "transformative" works and formulate something more useful. I'm my opinion, you can't build an LLM unless you have a large amount of data with which to train it. Given the huge amount of money companies like OpenAI hope to generate, it seems unreasonable that content creators would not be rewarded.