Ads.txt is an Interactive Advertising Bureau initiative to prevent internet fraud and to increase transparency in the whole online advertising ecosystem. By uploading ads.txt file to the root of your domain, e.g. www.example.com/ads.txt, you allow advertisers to check the validity of the domains they deliver their advertisement to.
If the advertiser’s ads.txt ID is missing in the ads.txt file on the target domain, the advertiser will refuse to deliver ads to this domain. Therefore if ads.txt is missing on your domain you are not able to monetise our games. It is therefore absolutely essential to always implement our latest ads.txt file across all your domains.
For more about ads.txt please visit the Interactive Advertising Bureau’s website.