you have to buy your books you have to pay for your meals you have to pay for on campus housing so they can just run off the money paid bt students.

I’m not an expert but it is my understanding that while you are technically correct about funding day to day operation many universities rely on government funded grants for conducting research and upgrading infrastructure. Also State and Community colleges are also heavily subsidized by both the state and federal government loosing it could necessitate a logarithmic tuition increase pricing many lower (and increasingly middle) income people out of a decent college education and denying them reasonable employment opportunity .