I'm guessing that the likes of daring fireballs ads wouldn't be blocked - they originate from the server hosting the website. Google ads and such would be blocked, because they don't originate on the site.

I can see the theory. First-party ads should (but very much could not) be more privacy friendly. Tracking the user becomes difficult because you need to convince people to add your tracking coda to their website without incentives like Ad payments. So you most likely have to tune ads to what is displayed on the page, ultimately making the page and the user's attention products (which is strictly superior to the entirety of the user being the only product).