That isn't the case in the US among most of the top 25 or top 50 schools. You can buy your way in to some of those schools, for most of them you do not have to. That's the fundamental difference. The top 50 US schools overwhelmingly consist of middle class and middle-upper class students.
If you want to dramatically improve your odds of family success in the US, you want to roughly be in the top half of the middle class bracket or above. At least based on school access.
A lot of the top 50 universities do as well or better at accepting bottom 20% income bracket students, as second tier schools do. For reference, share of students coming from the bottom 20% income bracket (ie poor):
UCLA 8.3%; UC Berkely 7.3%; MIT 6.2%; NYU 6.1%; Florida 6%; Chicago 5.5%; Columbia 5.1%; Rice 4.9%; USC 4.9%; Harvard 4.5%; Boston U 4.2%; Brown 4.1%; Stanford 4%; Carnegie Mellon 4%; Duke 3.9%; Tulane 3.9%; Northwestern 3.7%; Michigan 3.6%
Lower ranked schools (but still top ~15%):
Rutgers 6.8%; Illinois 6.1%; Texas 6%; UMass 5.8%; Florida St 5.3%; Michigan St 5%; Oklahoma 5%; Ohio St 5%; Oregon 4.7%; Georgia Tech 4.6%; Oklahoma St 4.4%; Oregon St 4.3%; NC State 4.3%; Texas Tech 4.1%; Washington St 4%; Arkanas 4%; Texas A&M 4%; Alabama 4%; Pitt 3.7%; Minnesota 3.5%; Kansas 3.2%; Kansas St 3.2%; Iowa St 3.2%; Illinois St 3%; Auburn 2.6%; Virginia Tech 2.3%
As a percentage, Chicago takes as many poor students as Oregon St; MIT takes more than NC State; Harvard takes as many as George Tech; Stanford takes more than Kansas St. And so on.
The schools that rank badly on high median family income and low access for poor students are who you'd expect: Princeton, Yale, Vanderbilt, etc. Notre Dame is a particular standout for being terrible, with a median income at $191,000 and only taking 1.6% from the bottom 20% income bracket.
You are saying "ability to pay is not a prerequisite", whereas the prior poster is saying "ability to pay can get you in".
Both are true.
The point I'm disagreeing with, is that I don't believe it's exactly like the US. It's a bit different in the US because of the selection available. The US has dozens of large universities to choose from that would all rank among the top 100 globally. Those schools have often been established for 100-200 years or more, with the US having an opportunity to build up a lot of high quality universities over time. That isn't the case in China (yet), their growing affluence is literally only ~15 years old, it's dramatically more pressurized accordingly. China has a lot of increasingly affluent people competing for far fewer top tier universities, which is why they've been sending so many students to the US and Europe.
At MIT for example, tied for the third best US university [1], they rank #137 on the median family income level among universities. That places them behind such schools as the University of Dallas, Virginia Tech and the University of Charleston.
Columbia is tied for the third best ranked US university. It ranks #89 on median family income. Those students are largely not elite rich families buying their way in.
The University of Chicago is also tied for third best US university. They rank #138 on median family income. Behind the university of Scranton, UNC Chapel Hill, and Xavier.
Cornell is ranked as the #16 US university, and comes in #87 in median family income.
California Institute of Technology is ranked #12. They're #105 on the median family income metric.
UCLA is ranked #19 in US universities, and ranks #353 on median family income among universities.
UC Berkely is tied for being the 22nd best university in the US. It ranks #214 on median family income, behind Babson, Mountain Saint Mary's, Vermont, and Willamette.
Carnegie Mellon is the #25 US university. They're ranked #81 for median family income.
Emory is the #21 US university, and ranks #120 on median family income.
The University of Florida is ranked #36 in US universities, and comes in #322 in median family income. You can go there for $6,000 per year in-state.
There are two dozen other top 50 schools I can add to this list, that rank far below what you'd expect on median family income.
[1] https://www.usnews.com/best-colleges/rankings/national-unive...