You might be interested in subvertising which actively works to reclaim the spaces invaded by advertising.

One could, in theory, download the posters and put them up over the relentlessly shite, unasked for adverts that permeate every part of your city. One could even buy a key which opens certain advert spaces - such as bus stops - and replace them with any image of your choosing. Obviously this is illegal and no one would ever do this, however, I assume wearing a hi-vis vest and beanie hat would work surprisingly well when not doing this illicit activity. Also, complain about the hourly rates if questioned and you’ll absolutely be left alone.