Aeolus Robotics Software Engineer interview questions

I've been invited to the interview process. Process took 9 months. (yes) They lost my answers to emails multiple times, and asked again. No clear or public hiring process, even if asked for specifically. They always give you just one more task, the next one. No single point of contact. There's always a new person on the other end, and you have to tell them everything from scratch, but it does not matter, in 3 weeks there will be a new contact again. Online Coding challenge (Codility) 4 challenges 4 (or 6?) hours, reasonable difficulty. There is a "whole day at job simulation" that takes 8+ hours, involves github, and you have to solve a problem, then enhance it further. They said they will pay $250 for the whole day test. Although that is not much, they did not even pay, so that was a lie unfortunately. 3 online interviews, 30min each. They won't tell you the real reason behind the refusal, just some unversal random answer. They did not even ask feedback about the hiring process, that's why I'm here. They changed the job description while the process was going on, and added a new requirement. Nice gesture though.