It might be much more difficult to a get visa for an interview than for the program in some parts of the world, because people are much likely to stay illegally if they are rejected.
FWIW, not one of over >30 people interviewed and rejected from Nigeria stayed back in the US illegally. That includes myself and my co founder who were the first Nigeria based founders to get an interview in 2014.
After all, there is a business to be built back home.
I didn't mean Nigerians or YC program in particular, but the general idea, that visa applications from different countries might be treated differently. Therefore, the idea of interviews in a "no visa required location" makes a perfect sense to me.
