just read a guardian article about that, they brought back advertising in a controlled way. This seems fair. Also Googled before and after pics of the city, can't say there was much of an improvement. I live in the UK, advertising is probably controlled by planning laws here, I live in a very historic touristy city, there's advertising but it doesn't impact the beauty at all.
Want something like that check out drab soviet era cities were advertising was banned.
Banksy certainly seems to have thin skin if he gets hurt feelings over adverts. Fuck that too, I'm responsible for my own feelings.