I should preface this by saying that I know very little about y combinator or startups or venture capital but I am technical. Here's what confuses me. I understand that getting accepted by y combinator is very difficult because there is so much competition. But on the other hand I've scrolled through the list of the companies that have been accepted recently and while some look super impressive, there are others that I don't understand at all. I don't want to actually name the companies but it looks like the products they're offering are things that any competent engineer could whip up in a few weeks and the underlying idea is also not very unique. Even to the point where there are pre-existing open source projects that do what these companies do. Perhaps they could still be successful businesses, however it's still difficult for me to reconcile this with how competitive it is to get into y combinator. So put it succinctly, how can it be super competitive yet still accept companies whose product is not unique or difficult to replicate? What am I missing here?