I don't know how these get funded by YC. I have followed YC from the beginning and it seems it funds so many of these startups on the "current thing" these days

I don't know how these get funded by YC. I have followed YC from the beginning and it seems it funds so many of these startups on the "current thing" these days. Maybe the founders they are funding are not diverse enough. Is there too much tracking on which universities they went to? So the same set is applying and getting funded?