Happiness Initiative interview questions

Need to complete a complicated assignment in 24 hours. Job application was rejected without the recruiter even looking at the presentations slides prepared for the assignment. When asking for feedback, they ignored it completely.

One video call, followed by a face-to-face interview, then a third group interview. for the second interview they require 2 take-home assignments, one of them being statistical analysis, and the second being a program planning presentation/ task. Their interviews tend to be very lengthy with my second interview with the founder, Simon, lasting more than 3 hours. The interview process is VERY effortful and time consuming for a couple weeks. After the third interview, they offered me the job and we discussed salary, I made my case for a higher pay than they offered as one should. They said they needed to consider this request. They took 2 months after this to reply substantially despite several messages politely requesting an update. Eventually the founder offered me the job at the original offer, and requested I start work in November, I accepted. I made preparations for this, but they did not send me the contract although they said they would. After chasing, he called me and said he was uncomfortable hiring me since I had attempted to negotiate a higher salary (whut?), he also said they decided they didn't want to higher for the position anymore (the ads are still up). TLDR: Probably a good idea not waste your time with these fellas.