I dont know why they do it and I dont care to find out. I just know I apply even if I dont match the complete criteria. If I tick off 60-70% of what they want, I'll apply. We are people, not machines. If something doesnt match but is close to it, we try and make it work. This is how the real world works. There are multiple factors at play and they can work in your favour.

I got my first job which required a college degree and some experience. I had personal (non-professional) experience and no degree. Showed an interest in the work they did, told them I work on my own things from time to time and got hired. What probably worked in my favor was a lack of other applicants showing the same degree of interest. I even told them I'd graduate in a year and we made it a requirement. Never got my degree and worked there for 7 years. No lying, some luck and showing an interest. Same strategy worked two more times (out of two), 1st interview and "wanna come work for us?". Its easier the second time since experience is built up already. And im not some extroverted silver tongued devil or anything. The right interviewer at the right time.