Shutterfly Senior Visual Designer interview questions

Pretty extensive interview process. Went through three rounds of zoom interviews. Each one seemed to go really well. After the final interview, I was asked to complete two design challenges within 3 days. After submitting, I was told I'd hear something soon. Followed up with HR and was told I'd hear either way by the next week. Never heard back. Followed up after a week and was completely ignored. Never heard from them again, not even to say they'd moved forward with someone else. Am disappointed not to get a job that seemed like a good fit but mostly disappointed in the lack of professionalism. To have someone interview with three different people in the company, tell them you'll let them know either way, then ignore them and never get back to them is rude and unprofessional.