Google wants everybody to sell Android's phones - that's how it promotes Android OS; that's how it competes with iOS. That's why Android OS open sourced by Google.
But at the same time, I think Google wants to sell it's own phones and competes with other Android manufacturers.
That's conflict of own Google interests.
And "other manufacturers" mostly care about their sales, - they don't really care about Android OS success - that's for Google to care.
Most of what makes Android, Android in non Chinese markets are the proprietary closed sourced parts that manufactures have to license from Google. Google has been abandoning more and more of the open source parts over the years.
But at the same time, I think Google wants to sell it's own phones and competes with other Android manufacturers.
That's conflict of own Google interests.
And "other manufacturers" mostly care about their sales, - they don't really care about Android OS success - that's for Google to care.