This document summarizes the harms of adtech and surveillance-based advertising. It discusses how advertisers track users across the web to target ads, which ultimately hurts the quality of media and user experience. Specific harms mentioned include non-human traffic wasting $4.2 billion per year, malvertising wasting $1.1 billion, and infringed content wasting $2.4 billion. The document recommends using adblockers and private browsing, paying for quality media and services, and supporting lawmakers and education to address these issues.