Do I need an ads.txt file if I am not running ads on my website? Or if I am only selling them directly? This is a question that is surging. If your site doesn’t have any programmatic partners or advertisement, you can still create an ads.txt file (listen here how), so you have the guarantee that no one is selling ads in a fake representation of your domain, called domain spoofing.
You can see in this article how to test or validate the ads.txt file. I did it for Youtube.com/ads.txt and this website has an ads.txt empty of ad tech vendors, clarifying all partners that the ads are not available on exchanges.
Here what is written on the Youtube ads.txt:
Websites without advertising or programmatic advertising can just write: