OpenTable interview questions

I had five interviews over four weeks. Recruiter screen, hiring manager interview, two interviews with peers, a case study assignment with two prompts (launch X product at OpenTable, and tell us a product you think is well positioned and why), then presentation to a panel of five people. I connected with some team members better than others, but questions asked were expected for a PMM role. After all these rounds, I was sent a generic rejection, and when I asked for feedback, they said it's company policy not to provide any feedback except they proceed with a candidate whose experience better fits the needs of the role. The lack of interview feedback is a cold end to a lot of time and energy invested.