I think there is real potential here, for smart browsing. Have the llm get the page, replace all the ads with kittens, find non-paywall versions if possible and needed, spoof fingerprint data, detect and highlight AI generated drivel, etc. The site would have no way of knowing that it wasn’t touching eyeballs. We might be able to rake back a bit of the web this way.
You probably wouldn't want to run this in real-time on every site as it'll significantly increase the load on your browser, but as long as it's possible to generate adblock filter rules, the fixes can scale to a pretty large audience.