Possible alternative explanations to what you're suggesting: 1. Growing up in a higher socioeconomic status environment does genuinely prepare you better for a

Possible alternative explanations to what you're suggesting: 1. Growing up in a higher socioeconomic status environment does genuinely prepare you better for academic and career success, so the correlation in university admissions is rational given that universities can only change a person to a limited degree. 2. 90% of everything is crap, and startups are no exception. But that doesn't mean they all are.