Or they could do what Brave, Vivaldi and others do and simply use Chromium as a base.
Don't you even see the problem?!
Even Microsoft dropped out from developing a web browser, it literally has a larger scope than a whole OS.
But sure, enjoy your Chrome OS proprietary "open" web.
Not sure if you remember all the "native" applets that actually were proprietary before Chrome came on the scene and made JS fast enough to kill them... ActiveX, Flash, Java... Those were the dark ages, because of Google the web is more open and better than ever...
https://www.w3.org/membership/list/
It's a lot more than just Google...