The Publisher Privacy Treatment (PPT) API is an optional tool that lets publishers indicate whether to turn off ads personalization for an ad request.
By default, ad requests to Google are served personalized ads. To turn off ads
personalization for an ad request, append &ppt=1 to your ad tag parameters, as
shown in the following example:
https://pubads.g.doubleclick.net/gampad/ads?iu=/21775744923/external/single_ad_samples&output=vast&ppt=1