If a prompt is commonly used, then it wasn't created by you, and isn't copyrightable. It has to have enough original content so it could be copyrighted. I am su

If a prompt is commonly used, then it wasn't created by you, and isn't copyrightable. It has to have enough original content so it could be copyrighted. I am sure a short poem is copyrightable. But then again, fair use also allows citing most (if not all) of the short poem.