It will not be considered as cheating as long as the project details posted by the campaign manager stated that "we have the rights to change the project details anytime" because sudden changes do really happen within the span of project promotion due to some reasons that is discussed between the project team and the campaign manager. You should always be aware that changes can do happen so always check up the project details every time. Reading all the project details must be done so that you are aware of whatever will happen. But it might come to think that somehow it can be considered cheating once changes happen without prior notice and at the very end of the campaign but the rules are being set by the team and the manager so they do have the rights to create sudden changes. We must just be keep in touch so that we can be updated in any unexpected changes.