Mozilla tried this. But the only people who want this is consumers. Advertisers want as much info as possible to target ads so would never choose this option unless heavily pressured by consumers.

Founder of EthicalAds here. In my view, this is only partially true and publishers (sites that show ads) have choices here but their power is dispersed. Advertisers will run advertising as long as it works and they will pay an amount commensurate with how well it works. If a publisher chooses to run ads without tracking, whether that's a network like ours or just buyout-the-site-this-month sponsorships, they have options as long as their audience generates value for advertisers.

That said, we 100% don't land some advertisers when they learn they can't run 3rd party tracking or even 3rd party verification.