Sometimes, merely being in an area with many companies can give the student awareness that they exist to apply to. For example, a student at SJSU or SCU may realize that there are many companies other than GAFAM that hire CS graduates, while a student at some distant school may not even realize that they exist to apply to.
Of course, the SJSU or SCU student can get to on-site interviews at Silicon Valley computer companies much more conveniently (for both the student and company) than a student at a distant school.