Nimble Robotics interview questions

Did a take-home assessment (the client/server project that other interviewers mentioned) that took 20+ hours, to which I received positive feedback. I was moved to the next round, which was an interview with one of their higher ups. The interview went well I thought, but I never heard from them again. Upon my own following up, the person I interviewed with never took the time to submit their feedback. I get that people are busy, but I find it quite disrespectful to get a candidate to do a super intensive coding assessment, only to not even take the few moments submit their interview feedback. I also find it quite unreasonable that they've apparently given this same server/client coding assessment to several other candidates, many of which likely have full time jobs and can't devote a whopping 20+ hours to a coding assessment. I really liked the company but this experience left a really bad taste in my mouth. They should do away with this server/client project (PERIOD) and not approach candidates unless they're serious about hiring.

After >2 months of contact, 4 interviews and 2 pretty involved assessments(one was a full stack project), I was ghosted after talking to the ceo. Cool company and people but how hard could it be to drop a rejection.