I would be interested to see before and after shots. Was their advertising problem really so bad or was just about the same as any other city? Edit: Found one: http://banbillboardblight.org/?page_id=4251
After watching that, I could easily support banning 3rd party advertising. But removing the ads for the business just under the ad does not strike me as better. It makes the business district look sleepy and quiet, rather than active and bustling. And as a resident I don't mind ads telling me what I can do/get/buy at a location - that's sort of what I want when I visit a business district.
Only to people looking at pictures on the internet. When you're there, there's just as much commerce happening as ever. Note that Brazil is one of the few countries that was able to evade the global rape that the finanical industries committed over the past few years.
What was the last thing you bought that was directly attributable to seeing a street advertisement at a location?