AdGuard, a strict ad-blocker and privacy protection app. Picture: Shutterstock/mariakray Web traffic that cannot be measured, and therefore monetised, by publishers has grown by 49% in the past three years, according to a new report. The new study from adtech company Ad-Shield claims to be the first to comprehensively measure and explain the scale of “dark traffic”. “Dark traffic” is defined as page views hidden to publishers by the strictest types of ad-blockers. These block all on-site analyti...