Ad moderation is one of the key filters between launching a campaign and generating stable traffic. Regardless of the chosen platform—Facebook, Google Ads, Bing, or native networks—the rules are becoming stricter, and the requirements for accounts, creatives, and the launch process are becoming more stringent. As a result, even experienced teams regularly face ad rejections or account suspensions. This article examines the main reasons why ads fail moderation, as well as the underlying logic behind ad networks' actions.