Earlier quoted context omitted.
No, what I mean is that manufacturers don’t have to include the play store if they don’t like Google’s requirements around using it?
Google forced them to take the Play Store and search widget (including default search engine) as a condition to get Play Services. Play Services is required by a majority of android apps and developping and maintening a compatible system layer is just out of reach of most(all?) device makers.
Ultimately Google will always have control over android if what you’re saying is true unless an alternative ecosystem is created