Casinos do not care rich and poor because they would run in negative balance without profits. They want to make profit from people losing but they know rich customers lose more money than poor people and students.
Students are not the wealthiest clients for casinos. They have bigger spenders than students. Poor people and students are some of the vulnerable clients gambling companies want to keep because they make up parts of their profits.
I think casino don't make any judgments about rich and poor gamblers because they prioritize their profits first. They categorize those who are rich clients who spend a lot. I think a casino can be most profitable if there are people from all classes, rich and poor and students, on a casino platform. If someone does something just targeting a particular class, then that casino will never be profitable. There are many poor or student gamblers who spend a lot on gambling which even many rich people cannot do.