Why do you think so often two similar movies are released close to each other (Antz & Bugs Life, Volcano & that crappier one, etc, etc)
Better example: When http://nowdothis.com/ came out, another 2 or 3 alternatives came out within a week of each other -- you think people "stole" these ideas from each other? I think it's far more likely that people just came up with similar ideas.
I'm not trying to be a fanboy when I say that an incubator would have to be crazy to compete with YCombinator head-to-head on an idea unless they think they have an amazing team. YC just has more history and better connections.
http://news.ycombinator.com/item?id=547991
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