Page and Brin were PhD students, so very much not just there long enough to decide it's not worth it, as they had at least graduated from a bachelor's, and had

Page and Brin were PhD students, so very much not just there long enough to decide it's not worth it, as they had at least graduated from a bachelor's, and had likely been there for more than a year after. Bezos graduated from his bachelor's degree. So really only Zuckerberg