Well, the way I understand it is that people have been fighting each other since our species first evolved on this planet. You didn’t need to be a military person or an aristocrat or connected to Shaolin or Wudang to be working on that. Everyone was engaged in it to some degree, especially in places where there was no law enforcement, you couldn’t call 911 for help, and there was no justice system for the common people. If a police force existed, it was more often a tool for the oppression of the common people. So the common people developed their own fighting methods because they knew they needed to take care of themselves.
It is my understanding that a lot of places in China over the generations fit this description to some degree or other. There are lots of systems that were practiced in villages or by members of a family or extended clan. This was part of their line of defense against bandits and thugs and ne’er-do-wells who might try to harm them while they were working in the fields, or rob them while walking home at night, or might organize an attack on the village as a whole.
China is a huge place, and likely a lot of these village systems still exist and have simply never been seen in the West. They are not famous, nobody has left the village to bring the method out of China or even into a metropolitan area where it might get noticed.