As sports betting in the U.S. soars, universities have been slow to recognize a potential problem. Only about one in five major public universities has policies in place to restrict sports betting or educate students about potential perils. A handful have sports betting platforms as corporate sponsors. Those companies have purchased the right to promote their brands at stadia and on university sports websites to students, many of whom are under age for legal betting. That’s a growing concern for betting-addiction experts who cite years of research showing that college students are among the highest risk group for gambling addiction.