Ad Stacking

Ad stacking is a prevalent form of mobile ad fraud where multiple ads are layered on top of each other within a single ad placement. Despite only the top ad being visible to users, advertisers are charged for all ads in the stack that receive clicks or impressions. This leads to fake impressions and/or clicks, resulting in advertisers paying for engagement that doesn't actually exist. Ad stacking poses particular issues for Cost Per Mille campaigns and is considered a form of click spam in click-based campaigns. This fraudulent practice diverts ad budgets from legitimate advertisers while increasing revenue for participating publishers.