Duo Security interview questions

I made it till the final round of interview which consisted of 7 round for 45 mins to an hour each. Interviewers and the process was pretty good. Only thing was I never got a feedback even after investing almost 7 hours + time in previous round. I understand if they get more better candidate than me but please at least have the courtesy to inform the candidates who were not selected. I even followed up with the recruiter and still no response. Too bad !!