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.
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.