Is that true though? I though pretty much all of the Google services and vendor-specific skins and OS modifications are just as closed as iOS? Last time I heard vanilla AOSP is pretty much unusable because besides the core OS functions everything is grossly outdated? Is anyone using Android phones without any of the Google services?
Yes I have a couple of phones running LineageOS without GApps. The apps are installed through FDroid or direct from the vendor ( e.g. WhatsApp.apk from their website, which also manages its own updates ).
Except for everything related to the Play Store, correct? And that is a critical part of Android at this point. Google is progressively closing Android.
One example is how in newer phones it will be impossible for apps to bypass root detection. I don't know why it should be anyone's business whether I want to run my banking app on a rooted phone or not, but this is the state of modern technology unfortunately...