Earlier quoted context omitted.
you can be motivated without going hungry. not being able to afford basic things is extremely stressful and takes time away from doing whatever YC wants them to do - that time is spent making sure that food is on the table. exactly the opposite of what you intend.
Yes - but this is what every company does at founding. Get really lean, survive on whatever it can. Founders should expect company building to be a nervous and anxiety inducing endeavor for 7 years. It is incredibly painful - and not for those who see it closer to a paid sabbatical
I think, as a point of failure, that most would agree that a system that allows a few people a 'free sabbatical' but also provides security for those founders who would not succeed without it, but who will with it is a good thing.