Idk why people keep repeating this obviously false statistic that NYU creative writing admits 50% of its applicants.
There were about 1,000 applicants this year. They made 16 fiction offers. I don't know exactly how many offers were made in the other genres, but we can assume it's somewhere in the same neighborhood.
It is true that there will be significant waitlist movement because people will decline unfunded and underfunded offers. But no, it is not reasonable to extrapolate from this that about 500 applicants will receive an offer.
According to Peterson's, in some (presumably recent) year, the NYU creative writing program had 823 applicants, of which 90 were ultimately accepted. That's 11% (the acceptance rate is likely lower this year). Of those 90, 45 accepted spots in the program.
https://www.petersons.com/graduate-schools/new-york-university-graduate-school-of-arts-and-science-program-in-creative-writing-000_10039074.aspx
So we can reasonably state that about 50% of those offered admission directly or off waitlists accept.
Again, roughly 1,000 applicants applied this year. If half of them were accepted either directly or off the waitlist, then there would be ~500 offers and ~250 acceptances. That would work out to something like 80 people in each genre cohort. That is not the case.
The cohort sizes aren't large enough to support this "50% acceptance rate" business. Please stop misleading people.