Large numbers of Stanford students are on financial aid and/or scholarships
Not sure that the presence of a scholarship, financial aid, or even a student loan necessarily proves poverty of the student’s parents.
Frankly if you are a student from a US high school accepted at Stanford and you don’t have a scholarship it’s because you probably made zero effort to get one.
Every university has some sort of financial aid page or program. Every university has students helping to pay for their tuition and costs with scholarships, cash, loans, you name it…the university doesn’t care how they get their scratch, just that they get it somehow.
My daughter had nearly a dozen different scholarships and her degree still cost me some money…and she also chose to take out a student loan too.