I wonder if part of the problem is that the people who develop websites and put the ads on (developers) are largely also the people who use ad blockers so they don't realise how bad the experience is for regular users
Developers realize how bad the visual experience is, how the tracking scripts, the megapixel images and the huge videos are ruining their perfect pagespeed insights score, slowing down everything, eating the visitor's mobile plan and are an awful waste of energy.
But developers don't control what marketing put in their sweet Google Tag Manager container(s).
Even if they did you think the average person is going to put their neck on the line over ads?
How many UX designers just give into client demands, how many devs work extra hours to make up for bad management practices? How many managers are under pressure over sales created deadlines? How many sales people are under pressure over the company's target numbers?
There will always be a few people who are willing to put their neck on the line but it'll require a culture shift before any momentum builds up and most feel comfortable protesting these practices at their workplace.
