I think Android is very different, because the open source parts of Android (AOSP) do not constitute a viable OS on their own. The entirety of what we know as Android is simply not open source.

To make matters worse, Google has put in place some legal roadblocks against device vendors using AOSP in markets where others can fill in for some of the proprietary Google parts.

These requirements are subject to regulatory action and I'm almost 100% certain that they will be deemed anticompetitive and therefore illegal.