How is it YC's problem? The founder is choosing to start a company and asking YC for money. Clearly they're not short of startups on the supply side of their equation.
You're not thinking about it the right way. It doesn't matter if they have "enough" applicants. They're trying to fill the positions with the best candidates out there - who they will just have to compete for. The more barriers they put up, the shittier the candidates they will get.
