Fullstack Labs Backend Developer interview questions

1) I was contacted by a recruiter via LinkedIn 2) He sent me a Calendly link to book an intro call 3) We had the call 4) I received via email instructions about the next steps: Asyncronous Interview, Technical Challenge, Technology Skills Survey, and Criteria Assessment. 5) I took the Technical Challenge, which is a take-home challenge that need to be recorded and your optimal time to complete it is within 1 hour and half (I spent 2 hours). The video must be uploaded to your drive and should be shared with them. 6) I also took the Async Interview, which is made via a platform with technical questions that you receive at the time of the test and you have some minutes to answer each question while it's recorded. 7) Finally, I also took the survey and criteria assessment, which are minor steps. 8) Before finishing number 7, I contacted the recruiter via email, and he gave me some feedback on the Technical Challenge, saying that it was the most difficult part and I had gotten an excellent score. 9) After the whole process was delivered, which took me 1-2 weeks, the recruiter simply vanished away! No response via LinkedIn nor by email. I already sent him 3 new messages, but no response! Final story: very well defined process, but it doesn't work at all! We don't even have another email to contact people to get some feedback.