MIT isn't in the Ivy League. The Ivy League, which is an athletic conference, consists of Brown University, Columbia University, Cornell University, Dartmouth College, Harvard University, Princeton University, University of Pennsylvania, and Yale University.
Endowments are independently run and the last thing the money men would do is give the admins or academics a say, or they’d fritter it all in short order, like how Larry Summers lost Harvard a cool billion dollars through ill-judged investment strategies for its operating funds.