My college was a public state school (Georgia Tech). While it is a great school, it was public and affordable (could be done for nearly free in-state). But it definitely was not some super difficult to get into exclusive ivy club or the likes.
So it seems like they indeer attend a rather wide variety of schools, given the size of their company. But they aren't a mega giant like Microsoft/Amazon/etc. that can afford to directly send people to recruit from almost every school in the US, their headcount was under 1k total iirc, and significantly.