[joe_hills]

A computer can generate billions of unique seeds, but not billions of relationships with your sales team.

Maybe don't allow companies you don't trust to buy ads?

If only companies with a relationship with your sales team can buy ads from you, and they know they'll lose that ability if they run a fake AI ad, then you have far less to worry about.

It could be argued that this may work for newspapers, TV, and radio stations, but can't scale for serious websites. Serious websites won't be taken seriously if they can't get this under control, and folks will be turning back to newspapers, TV, and radio stations to get away from it. Don't make them competitive again.