Amazon Sr Project Manager interview questions

Spent over 60 hours of preparation and total of 8 hours for the actual interview process spread across 4 days but Amazon Tokyo ghosted me after my final interview. I would expect at least an auto rejection email to inform me about the result because of the hours spent to their long and exhausting hiring process. It’s very unprofessional to not hear back from them after all that. You probably heard a lot about the culture, this is a sign. It might have been a good thing for me anyway not joining them.