Can you provide some specifics? You say you observe this trend in YC startups? Is it because people are applying as they finish school and need a different visa to stay and participate in YC? Is it because you get lots of applicants from people not in the U.S. and they can't even get a visa to fly over for the interview? It can't be because the founders can't "hire" good talent. The YC process isn't enough to pay salaries.