Imposing restrictions on OEMs got them in a bunch of trouble in the past, and restrictions like what you're suggesting are actively getting Google in trouble (s

Imposing restrictions on OEMs got them in a bunch of trouble in the past, and restrictions like what you're suggesting are actively getting Google in trouble (see the recent fine imposed by India). Incidentally, this kind of thing is why my personal laptop is a Microsoft Surface, and my personal phone is a Google Pixel.