I predict a huge increase in the number of applications this time, thanks to all the publicity and YC success stories. Good luck to everyone!
(1 of those 20 immediately merged with a startup from a previous round, so only 19 came to Cambridge.)
If they get your application, and it says "I am from India and can't leave", then by their own rules that's broken, but there's no penalty for asking stupid questions.
How you react, as you come to realize that the question you are asking is a stupid one, probably says something relevant about a startup founder.