Culture issue. From How to Apply to Y Combinator[1] by Paul Graham:

"Please tell us about the time you most successfully hacked some (non-computer) system to your advantage."

> we’re not looking for the sort of obedient, middle-of-the-road people that big companies tend to hire. We’re looking for people who like to beat the system.

1: https://www.ycombinator.com/howtoapply.html