I looked it up, and UT Dallas's most recent endowment numbers are $500 million. I know the state is really good about funding and the state isn't in an especially precarious situation, but "Wisconsin, and Illinois and Ohio State, which together enroll nearly 190,000 students, add up to about $11 billion" still puts UTD well below their mark and 76x less than Harvard's 38 billion.
It's been constant growth for at least the last 10 years, so not sure where the funding differential is, what allows a smaller college to thrive, while bigger and more prestigious ones have financial concerns. To be fair, UTD does a fraction of the research of the bigger colleges, so maybe it doesn't come into play.