A random mix of college-aged kids is one of the worst deals as a land lord because they are guaranteed to be transient. I don't blame anyone who refuses to rent their mansion to them.
Kids whose parents sign their leases and pay their rents will almost never fail to pay rent, and if you do have a problem, their parents are almost always going to save their asses in fear of breaching contract. At least here in Texas, contracts and tenancy laws greatly favor property owners. As you can imagine, there’s the risk of having people damage walls / floors / plumbing, but in my experience that stuff is mostly trivial to repair and that is what damage and security deposits are partially intended to cover. When I was a student I repaired drywall at every place I lived, some minor, some major, and was never charged a dime at move-out. Most new apartments have a standard procedure of repainting between every tenant.
Or they could just do what they are doing now, which is completely legal.