I had three simple interviews and then after that silence. I had to constantly reach out to HR. Then I had one last interview and silence after reaching out a week later for an update. I'm fine with not getting a job, but after four interviews, I deserved a proper no. Don't waste your time, because if this is how they treat you during the interview process, please understand that this is how it will be at the company. Ghosting someone is a huge red flag. Save your sanity and time.