I live near Seattle Washington and there are very few here. Pretty much only on Indian Reservations. But last summer I was on a road trip that took me through Salt Lake City Utah and there were SO MANY BILLBOARDS along the interstate there. I can’t believe the people put up with it.
No idea then. I use adblock on all of my devices, but sometimes things slip through. And I sometimes click on one of those SEO fake "articles" that are really just ads when I'm searching for something.