Well, that's the risk every startup should take like us. Same scenario if we submit a business plan to VCs... the more we expose our ideas, the more anyone can dupe it. That's why a friend of mine who founded Chikka.com said, implement your demo first so no one can just grab it but that rule doesn't applies to all. Though we did our demo already. Why would the YC spends time replicating it when there's already an existing one. And their playing field is more on assisting the startups get funded. So far, I haven't heard any negative feedbacks from YC so I'll take that as sign of trust and integrity. Nobody likes to get dupe!