Databricks interview questions

Fairly standard process. Recruiter schedules phone screen, phone interview with short technical screen, and then onsite. Everyone was really nice onsite and I talked to over ten people, but in the end the recruiter was very unprofessional. She told me I would be given feedback and a result a day or two after my onsite but ended up not replying at all. I followed up and asked for any kind of feedback and there was no response. I expected that I was rejected, but at least just send an email or something.

They want me to work on an assignment. After I spend 6 hours finishing this assignment, they sent me a reject letter. I think this is a waste of time.