Earlier quoted context omitted.
You can't even install the resulting binaries of an opensource Android build on a phone because of gaps. And even if you could (or fill in the gaps) Google poisoned the ecosystem by ensuring almost all Android apps require Google Play services. Which aren't open source and you realistically need for all Android apps. So no, Google made sure there is no open source Android. There are just some (incomplete) source dump…
Gapps were ever open source. Android, the operating system, is what's open source. Are you saying because Google Maps isn't open source, the operating system is useless?
Simply said probably none of the apps you installed on your phone are going to work without Google Play services installed. Google Play services are closed source. Which is why manufactures like Samsung need to sign a contract with Google and can't simply "install opensource Android". Samsung could live without Google Maps being installed and they could even live without the Google play store but they can't live with none of your apps (like your bank app, your Netflix app, etc.) working.