Edge Impulse Full Stack Engineer interview questions

I did greatly up until the last phase but I was not given an offer. They didn't tell me why and when I asked for a feedback their answer was "We don't do that". Shame on this company for this behaviour. Between one phase and the other, I heard back from them in like 10-14 days, that's something going on if they can't provide an answer in a shorter time. This and the general impression I had of them during the interviews, leads me to think that they are not really hiring. I don't get why they should waste people time like this.