imagine if we had a browser like kagi with its own engine from scratch where you are not the product and it charged you a monthly subscription for privacy free browsing
You're the product in Firefox, just a different kind than in chrome. Ad Nauseam is silly because ad companies know they are fake clicks and don't count them. Ads aren't the only thing you'd need to block from the internet.
There is zero evidence Ad Nauseum does not work, but there are plenty of signals it does. Google banned it from the Chrome store and setting any threshold below one hundred percent click rate just uses random.
Even if it is somehow detectable it's just Ublock origin and not every ad network is worth billions of dollars
I mean, Orion exists (on Mac at least, although I heard there's a Linux version now?). Might not have its own engine built from the ground up, but WebKit is pretty much the next best thing.