alt Hacker NewsSame reason as "make another (better) windows" is very difficult - almost everyone wants to be able to run existing apps and drivers, so you're forever playing compatibility catchup with android (or windows).
That's the reason companies are desperate to be first/biggest - once you're it, you're it until you finally fall on your face and dwindle to a nobody.
AOSP is open source. There are plenty of AOSP-based systems (starting with GrapheneOS). No need for a new one.
The thing here is that Google is building technology to prevent alternatives from connecting at all. We fundamentally cannot solve it by building more alternatives, we have to prevent Google (and TooBigTech in general) from doing it.