If even WWII-era documents are still under copyright, building a model respecting that would be impossible.
That excess exists precisely because of the industry’s clout. For decades, rightsholders successfully lobbied Congress to extend copyright term again and again. That process appears to have finally plateaued, which is why early Mickey Mouse has now entered the public domain.
And notably, since the rise of AI, the government has not been especially quick or eager to step in and defend rightsholders.