Does Google provide any kind of "interview fund" to the applicant? Otherwise the mere fact of being there - flights, hotels, travel - says a lot about the applicants socioeconomic status. Just a 3 day trip (hotel, car, flight) to MV from my area is starting at $1500 - $3000 from a quick look around.
Is the worry they are going to reveal that they just hitchhiked or spent the last 100 hours on a Grayhound and walked to the campus from the bus stop?