Censys Senior Software Engineer interview questions

I've been interviewing a lot lately; Censys has been my worst experience to date. First I got a rejection email, then I got an interview request. Thought it was weird but went with it. The process lasted a little over a month. I had 5 interviews with 6 people (which was different from what the recruiter told me the process would be) with a 4-hour coding assessment in the middle. After all that, I was told no with no feedback given. Asked the recruiter if they could shed any light on the decision, but they said they don't give feedback as a matter of company policy. Their process is an inefficient use of their time and their candidates' time. And I found it frustrating that I got zero feedback after going through the entire month-plus-long process.