Article says,
> Brcmfmac is a Linux driver (ISC licence) for set of FullMAC chips from Broadcom
I don't feel like looking to see where the Linux driver came from, but someone provided a permissively-licensed driver.
It's originally from Broadcom themselves. A lot of Broadcom hardware runs linux natively (i.e. mobile and embedded CPUs), and a ton more of it ships in linux-adjacent devices (routers, android devices, etc)
People should be empowered to share and tinker, without feeling like they need to setup a bug bounty program first. Not every GitHub project is a vendor/customer relationship.
There are people for whom a software that compiles without error is for productive use cases
> Someone might try to use it and get pwned!