DraftKings Product Operations Associate interview questions

After passing the initial phone screen, I was invited in for an interview. The interview had three segments. The first segment was a set of case studies with the employee from the phone screen. The second segment was a Q&A with the head of product operations who seemed disinterested and distracted. The third segment was a set of math questions with a very friendly team member. I was contacted the next day and rejected without explanation. Some feedback would have been extremely appreciated but was not provided even upon request.