Our rules are there to ensure that a person can provide usable files for the project. About the chosen projects. Please think about it. Why do you not do a little research and find a project that is looking for a design and graphics assets?
The reward is meant for people enhancing and cooperating with the projects. You may think it is unfair as your contribution has not been approved but work of someone else had. I believe that the proposed logo would not be simply used because of it is known worldwide and that they would prefer closer cooperation if they decide to change its identity.