Most advertisers will not be satisfied with that. The real question is if regulators will be and therefore can use this as a reason to clamp down on advertisers

Most advertisers will not be satisfied with that. The real question is if regulators will be and therefore can use this as a reason to clamp down on advertisers. If so this might work, but I am skeptical. And either way it was wrong of Mozilla to sneak this in as opt-out.