You might not understand what homebrew in a software sense is then full stop. Homebrew in software just means not commercially made/backed.
GNU/Linux and plenty of other open source projects that power your modern life and the internet started the same way.
Realistically nothing is stopping them from doing so it’s their own policies which is kinda dumb af. All they’d have to do is prevent ads from brands that don’t want to be associated with it from showing there.
The fact they don’t show advertisements on NSFW subs/posts just tells me their advertising tools and targeting are absolutely sub par.
Personally I try games out on Gamespass and if I actually enjoy them enough and want the extras I buy it on Steam.
Couldn’t do it to myself, there is a reason MVNOS are cheaper they get deprioritised access to the network and the big one they collect all your data for selling.
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.