You don’t need anthroporphism to draw the conclusion that using copyrighted material in model training is fair use. It extends pretty directly from existing fair use doctrine surrounding transformative uses of technology, in particular from Authors Guild v. Google, where the 2nd circuit ruled that creating a searchable database of copyrighted material (i.e. Google Books) was transformative, as long as the material presented to the end user was limited snippets of text and not the entirety. Bartz v. Anthropic explicitly cites that case as precedent