Dana-Farber Cancer Institute Program Manager interview questions

One Zoom interview with hiring manager, then onsite for 3 hours to interview with 5 other people and the hiring manager again. Everyone was extremely nice and enthusiastic. Six interviews with them, and I found out I was rejected by checking the application portal. They couldn't bother to send out even a form rejection. Maybe it's petty but it's soured me against applying with them ever again.