I don't understand that last bit. Can you expand a bit please? Earlier comments in this thread say the copyright on a model is a grey area and can be classified

I don't understand that last bit. Can you expand a bit please? Earlier comments in this thread say the copyright on a model is a grey area and can be classified as fair use https://news.ycombinator.com/item?id=23094601 https://news.ycombinator.com/item?id=23094601