Ancestry Senior Software Engineer interview questions

I initially took an online assessment through CodePair. You have 1 hour to answer 3 coding challenges. 2/3 were very easy with the 3rd being rather ambiguous. Following that I did a code pair interview over the phone (and CodePair) with an engineer where I did some more coding challenges while answering questions on my approach, process, and AWS. I was then invited to a 6+ hour interviewing “blitz” where I met with several different people. Not all interviewers had open spots on their team so it was difficult to ask pointer questions on the open role. The idea was for them to get an idea on where you’d fit in the organization. The whole process went very well and one interviewer told me I would move forward and “wanted me on their team”. After 3 weeks of little to no response from the recruiting team I stopped following up. No feedback as to why.

Got a call from Recruiter, was asked to attempt HackerRank online test, did very well without copying anything from Web or Google. They asked me to come for an onsite face-to-face interview, I delayed for two weeks due to my health condition, later connected them to confirm the onsite interview. They Rejected my application for no reason, later another recruiter told that it's a mess everywhere as they are hiring 200+ Engineers, HackerRank was a complete failure as people copied from the Web and later in onsite interview failed miserably to answer simple questions. Hackerrank test was a complete failure in their interview process, now they have rejected all the candidates having good scores and would like to reinvent their hiring process. I invested my time, followed right path but still got rejected. How can every company in this world hire Top 1% candidates in IT industry? and 45min online interview or 4 hours interview process evaluate the candidate. It's a silly question but needs an answer from industry, somebody needs to fix it.