One big reason is the Mr Robot TV series. The main character uses Kali Linux for "hacking", and it was quite a popular show amongst casual computer users. As a result, many people who had limited knowledge about security started installing Kali Linux on their laptops so they could be "hackers" too.
Maybe I’m just not remembering, but I don’t think the show ever goes into exactly what distro Elliots running. I’m pretty sure you only get glimpses of his de which is usually GNOME, but I’m pretty sure I saw cinnamon at one point.