it's fine to not win. i've won and and i've lost. i just won at Facebook last week. but i expect that what they ask to review, they review. i can't find anyone who said they detected any launches during the review period. i would have expected to find ONE person. don't run a hackathon with strict rules and a long development period and ask for source if you actually are NOT going to run the app. just be honest and ask for a wireframe or a f*ing powerpoint.