It's kind of an open secret that the city of Santa Barbara (CA, US) has banned several forms of public outdoor advertising: we have no billboards, no promotional posters, no taxi toppers... It's delightful, and very high on my list of reasons why I enjoy living here. Every time I leave I'm reminded how noisy space is when it's filled with advertisements. I wholeheartedly recommend others advocate for similar policies…
Then you look at what the older tube stations looked like and they're quite pretty; lots of mosaics and other works of art, each station having a distinctive style. Now it's white tiles, white LED lights, and adverts.