Would putting it on the DNS work as expected? Hypothetical Example: Two websites have google ads WebsiteA and WebsiteB. I want to support websiteA by allowing g

Would putting it on the DNS work as expected? Hypothetical Example: Two websites have google ads WebsiteA and WebsiteB. I want to support websiteA by allowing google ads on there but not on WebsiteB. The only way to allow google ads to WebsiteA would be from the DNS which would also allow google ads to WebsiteB.