If you copied the table of contents of a famous book and happened to make the book significantly better then there's a chance people would read your book instea

If you copied the table of contents of a famous book and happened to make the book significantly better then there's a chance people would read your book instead of the famous one. Should the original owner be allowed to sue you in that case? I think the same applies for APIs. It's only taking away users from the original implementation if the new one is better.