LinkedIn interview questions

I applied on their website, and after 5 Days, I received an OA. The OA wasn't hard. After one week, I received an invite to the phone stage, completed it, and I got a rejection.

4 total rounds, Excel take home test, phone screen, case interview, then the last round which is a "superday" that's around 4 hours back to back interviews. The last round consists of a case interview, group interview, behavioral rounds, and a final case presentation.