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Homebrew software is unofficial/non-commercial software for systems which were originally set up with proprietary software (like gaming console or in this case car OSs).
That’s the definition for games consoles specifically, I know you pulled it from wiki :)
Every computer that comes preinstalled with windows also falls under your definition though as does any Mac.
Linux was also developed for or spurned by a system that was proprietary and only for educational purposes MINIX.