Maps' ads are a little more pernicious than billboards. You'll note that Google doesn't display all the businesses that appear on a map every time, but if you pay up it will display your business, even make it prominent.
OSM shows all businesses (as far as their data goes) and that is the right way to go. There are ways of dealing with clutter. The fact that I can't find what I know is there on Google Maps (unless I do a text search for it) is infuriating and a deal breaker.
Not blockable by ad blockers, you have people with intent to drive by certain places, or drive to certain places.