Yet another possibly non-canon idea:
Waste reclamation is a big deal on Hearthside since most of the planet is desert.
A polymer can be extracted from yinrih excreta that can in tern be made into a durable plastic.
Hearthsider currency is made of this plastic.
You may have noticed that Hearthside is very anti-corporate. That's partly thanks to the legacy of the Pious Dissolutionists, and partly due to injunctions placed on the Bright Way after the war by the other winning factions. One of those injunctions is that any discoveries or inventions that come out of research monasteries must not be commercialized. Everything they do is now put under what humans would call an Open Source license.
The mass router is a product of a research monastery (Hearthfire, Morningstar et al. being research monks), and thus there is no patent restricting who can manufacture mass routers.