I may have an overly STEM-centric view, but I don't think Yale has anything like the reputation of MIT internationally. I'm only really aware of it from Americans (in Hollywood, newsletters, etc.) being impressed by lawyers' and MBAs' credentials.
Anyway, I don't think the specifics really matter, point is it's not unusual to have a bunch of extremely good universities and then a handful or fewer that are for whatever reason the first-to-mind 'best' ones.
This is likely; international vs. US also probably makes a difference, as three of the last six US presidents (by person, not year) were Yale alumni (no MIT alumni have yet become president, but I think it's a good idea!)
And five are Ivy League grads: Obama from Harvard Law School, and Trump with an undergrad degree from Wharton/U. Penn. (Biden being somewhat of an outlier, having attended U. Delaware and Syracuse University.)
Anyway, I don't think the specifics really matter, point is it's not unusual to have a bunch of extremely good universities and then a handful or fewer that are for whatever reason the first-to-mind 'best' ones.