Because loading all the (daisy-chained) 3rd party scripts and then spoofing clicks on ads compromises your privacy and on top of that, costs major page load and

Because loading all the (daisy-chained) 3rd party scripts and then spoofing clicks on ads compromises your privacy and on top of that, costs major page load and radio/data performance, compared to blocking aggressively as Brave does. This may amount to $23/month data-plan cost to user, per a NYT study).