In addition to what everyone else has said, UF has over 50,000 students, making it one of the five largest universities in the USA, iirc.
The first time I walked on the campus, it blew my mind. I'd never heard about Florida International University as an American, but it's easily the biggest and most beautiful I've seen.
Although I wasn't a graduate student so maybe way more of them have access than I realize.
To be eligible for an account on HiPerGator, you must be on an education or research project that has as one of its Principal or Co-Principal investigators a faculty or staff member at the University of Florida.
I'm also a UF alumni (undergrad & grad EE), and IIRC back in my day high performance computing was a grad class. I never took it, but it wouldn't surprise me if for the grad class there would be labs on the super computer where students can get limited access.
Recently, it also became possible to use C++17 stdpar and get GPU acceleration (https://docs.nvidia.com/hpc-sdk/compilers/c++-parallel-algor...).