Possibly a naive question, but why would you need a credit score for being hired, especially as an intern? I can (somewhat) see the need for privileged positions (i.e. CFO or similar).
It was a bank, that was just standard procedure for everyone. Technically I was a contractor not a intern (and it "just happened" to be for a summer between two semesters of university), but I doubt being an official intern would have changed anything.