Earlier quoted context omitted.
But they can already do that, because most people and apps (outside China and maybe some other regions) expect Google Play/Play Services to be present.
What apps? I think only android auto requires it. All the rest works just fine with occasional glitches. Of course that most probably greatly depends of what kind of apps you are using but usually microG is just enough.
Many banking apps will outright refuse to run on rooted devices, much less google-free forks.
There are ways around that but those ways are unreliable and could break at any given time -- I am not risking losing the ability to pay for things online just for the sake of running an android fork. (in my country, all the banks switched to requiring 2FA from their app if you make online purchases with your visa or mastercard)