At this point, the play store has such a monopoly that they can do whatever the fuck they want. That’s why there are so many ads.
In my opinion, software that can be considered required for hardware that you’ve paid for to work (OS/system level apps) should not be allowed to have ads by law. It’s also a double infraction when they bait’n’switch you by slowly rolling out more and more ads on a phone you already bought.