This is a startup weekend, though. I don't know what all the weekends have done, but for the ones that I did pay attention to, they did almost zero due diligenc

This is a startup weekend, though. I don't know what all the weekends have done, but for the ones that I did pay attention to, they did almost zero due diligence on their idea before starting work. If an idea has been done before, more players are still welcome, of course... But you should know that it has been done before, know what the competitors are, and intelligently design your product based on the existing market. Blindly creating a startup without this knowledge is foolhardy at best.