Yeah I’m thinking of something where the system showing the ad can give tags/keywords and corresponding ads show. Each instance can decide on whitelist/blacklist basis what kind of ads they want to send out (e.g. specific advertisers, sfw/nsfw, banner/text/video).

So you would subscribe to a specific instance of the ad service and get only ads they deem ok, including ads from other instances. So you can publish to all instances but the instances decide what they give out/show.

Edit: Typo & sentence structure