Most of that is conjecture. What they choose to block is not a browser responsibility but one of the search engine results page. When they block new tech threatening their business model it'll be months if not years before anyone "gets it".
Why isn't it a reasonable thing for a browser to do? I do a search and get some results. I click on site A. site A has a link to site B. I click on this link. Site B is full of ads that meet Google definition of an abusive ad. I'd appreciate my browser blocking those ads on site B even though I didn't get there via a search page.