I know about it. It's pretty popular, so much in fact that you can buy a wide range of routers with it preinstalled.
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I only know one company that sells routers with openwrt pre-installed. It's called Gl-inet.
I am aware of openwrt and used to use when I used router hardware. I have moved to pfsense. I install it on either a 1 liter mini PC or some other older enterprise piece of hardware.
In my experience it's because it's finicky as fuck and requires very specific (and often more expensive) router models, and even then it still crashes just as much as a proprietary os router.