With you on the absurdity.Short answer, if he knows what he is doing then you have zero chance to solve it. At the moment it goes so far that google has banned entirely verticals in some countries for ads because there is too much click fraud. Funny because this click fraudsters know now exactly how too find new advertisers haha just blast a vertical with fraud clicks until they shut down the vertical and you have a handful of new advertisers, that are looking for new ways advertise. shady but it happens. Really blow my mind that google not understand that this is what they create with such actions.
I'm sure in most niches in most countries around the globe, this isn't a manifest issue, but I'm sure it is frustrating for companies that woke up one day to an ad account that no longer can serve ads in their niche.
May I ask the original poster, if they're reading, if you can share your locale and niche?