When my daughter was a student there, she and her classmates were given leads on internship opportunities via the KF career center, which as you indicated, is limited to KF students and business minors. They were also provided with many opportunities to attend KF-only events which were also attended by representatives and speakers from local and national companies in a variety of sectors, where they were able to network and pursue opportunities. These events were not open to those who were not KF students.
And yes, they have to hustle for sure. Every student at every business school who wants to get into this field is very likely hustling.
Of course there’s nothing preventing someone with an major outside KF from pursuing opportunities at these same companies on their own, but part of the allure of admission to KF, the reasons it’s competitive, highly rated and the reasons students are willing to pay an additional premium to attend, is because of the course offerings, networking opportunities and assistance with internship and job placement.