> Are granting us an irrevocable, royalty-free, worldwide right and license to: (i) use, review, assess, test, and otherwise analyze your Entry and all its content in connection with this Hackathon; and (ii) feature your Entry and all its content in connection with the marketing, sale, or promotion of this Hackathon and of Salesforce.com (including but not limited to internal and external presentations, tradeshows, and screen shots of the Hackathon Entry process in press releases) in all media (now known or later developed);
Maybe this isn't their intention, but win or lose there's nothing stopping Salesforce from taking your submission and running with it.
They will surely have enough info to recreate your submission, but the language above doesn't explicitly allow them to make commercial use of your submission.