With big brand type stuff, I'm getting the impression that alot of ad spend is not ROI calculated. Businesses just kinda say, okay we're gonna spend X% of our revenue on ads and that's that. So, ad blockers won't influence that. I remember hearing on NPR how they went to some business that had been spending millions every year on advertising for countless years, it had always been that way so no one questioned it and then they proved that all their ad spending had 0 impact on their product - the managers were floored.