GoFundMe interview questions

I applied online via LinkedIn. They contacted me after 3 weeks to do the first phase of the process: a written exercise with 5 questions, including creating a fictitious campaign and giving them feedback on what could be improved. After spending almost 2 days on it, I sent it and a few days later they sent me an email simply saying that I was not chosen to go on to the next round without any explanation. What I didn't understand is that after putting effort in making a test, I don't even know the reason why I didn't pass (lack of experience, inadequate profile...) that could be useful in the future to improve. I found a very cold attitude from human resources.

First a phone interview with their recruiter which took about 30 minutes. Eventually heard back and got an in person interview. They'll tell you it will take 1-2 hours. If you only meet with the first two people and it takes one hour, you didn't get the job. If it goes well with the first 2 then you'll move on to another interview with higher managers the same day. The first 2 interviewers were super friendly, encouraging and easy to talk to for the hour. It went very well. Then i shadowed somebody for about 15 minutes. Then onto a second interview with 2 different managers which went terribly. They didn't give any feedback to what I was saying- no nodding along or anything, just staring at me, which made me very uncomfortable and stressed. They kept asking me about negative experiences with past employers which I didn't really want to talk about in an interview and put me in a negative head space. This lasted for an hour. Hoped that since the first interview went well that I still had a chance at the job but heard back a few days later that I did not.