The image that you chose to use is not your own hence our warning. We clearly state in our user guide that plagiarism of any content, including pictures, will receive a warning. I am sorry if you feel it necessary to not use our service based on a warning system that we use for everyone but we value giving credit to all things used to create quality content.
I agree that information can easily be argued as not being "original" due to the vast amounts of information at our fingertips, however, photography is something that is almost impossible to recreate in exact replica. All we ask is that you provide a simple source of where you found the images.