In many places where these signs are banned, old grandfathered-in examples have become beloved heritage landmarks.
The musée Carnavallet in Paris has a fascinating exhibit on the city's history based entirely on old business advertising signs.
An example here in Vancouver: https://vancouversun.com/news/whats-the-future-bow-mac-sign-...)
I detest a lot of modern forms of advertising as much as the next guy, but at the same time I think we'd be choking off a lot of interesting and enriching human expression by trying to remove it entirely.
Just because it was done in the past, and is interesting to learn about, doesn’t mean we shouldn’t outright ban it.