There are lots of cultural opposition movements online, like against work exploitation, consumerism, car culture, surveillance, intellectual property, etc. I can find communities on lemmy for all those topics. But regarding a more general opposition to advertisements and marketing, other than the occasional person telling others to use adblockers online (what about ads in every day life?), I fail to see organized attempts to challenge advertisements. There is a lot that can be scrutinized. Ethical concerns such as manipulation, lack of consent and just the simple fact your attention is for sale. The effects range from damage to environment, to our mental health, to harming industries themselves, lowering product quality and maintaining monopolies.
I remember a time when webpages had banner ads that didn’t flicker and make it impossible to read the page, and that also weren’t based on corporations spying on you. If it had stopped there, we probably wouldn’t be having this conversation right now. Even a few second pre-roll ad before a video starts based on the video content and not the user’s history would be annoying, but something a lot of people would tolerate. But no, number must go up!