If ads were merely about being informative, they would be boring. But ads want to manipulate, so they have to be flashy and appeal to your emotions.
They pollute your mental headspace, and have no place in a healthy society.
Let's ban billboards. And then let's follow that up with a general purpose ban on paid advertisement.
I think the latter part of that is a huge jump. How is seeing a billboard for a plumber promoting bad behavior?
Even then, you've probably not picked the best plumber this way.