Advertising makes up more than 80% of Google’s revenue, so it’s definitely something they take seriously and try to optimize. Every year they release a report covering how many bad ads they removed as well as what they are doing to prevent this content from appearing on their ad network.
While this year’s number is down from last year, it’s likely because Google has focused on blocking rogue advertising accounts and publishers before their ads are seen by viewers. With the addition of 330 new classifiers, their machine learning detection techniques resulted in the termination of roughly one million bad advertiser accounts and 730,000 publishers.
