(a publisher buys impressions and clicks and sells them under the CPS model). One can concern themselves with traffic arbitrage using various systems. The most popular of them are:
Contextual advertising (Google Adwords). Configured in accordance with search queries. Many are wrong thinking that if the publisher launches contextual ads to the advertiser's website, they will engage in an auction, thereby increasing rates for impressions. In fact, contextual advertising systems employ the no competition rule if links lead to the same website (even from different advertising accounts). To help publishers, who spend their personal budgets on launching contextual ads, we recommend providing them with a list of negative keywords that will help them avoid non-target actions. If the advertiser wants to, they may forbid only branded contextual ads.
Targeted advertising on social media (Facebook, Instagram). Configured for specific users supposed to see the ad in their feed. It's advisable that you provide as many audience details in the program rules as possible (including age, gender, region, education, devices used, hobbies) so the publisher can make the ad very specific and only visible to potentially interested users.
Teaser and banner networks. Configured with the help of targeting tools; however, a user can see an ad not in the social media feed but on a website with which a social network cooperates. This system comes with two elements of risks. Firstly, you don't know on which websites your product is going to be displayed (children's goods may be close to adult content). Secondly, there are so-called gutter teasers that may spoil the business' reputation (usually, they try to grab user attention with shock content and false statements). We don't recommend rejecting entirely this traffic type (recall great examples of white teasers). Instead, approve it beforehand — i.e. require the publisher to show you ad creatives before publishing.