There's AOSP admire android. AOSP is open source which is some components of the Android system - however a lot of Android is not just AOSP. A lot of it is Google web services and other proprietary stuff.
You don't have to use "Google Android" to use Android. LineageOS + F-Droid + microG is a very good setup, I use it on my phone.
The real problem is the hardware driver blobs.
But many of these services are also available on iOS.