8 out of the top 10 manufacturers are Chinese. Google has to be careful here, otherwise Android will end up as a Chinese consortium and their own version will just be available on Pixels.
But Western consumers at large won't buy Chinese devices if they don't carry the Play Store. And many Western app developers won't want to deal with Google Play Services and it's APIs missing, which is what made porting to Amazon's Android fork annoying as fuck.
That's the huge, huge carrot that Google carries in front of everyone thinking to fork Android.
Sundar Pichai will need to take a class from Dario in open source fearmongering.
Or China will migrate to Harmony and drop Android altogether.