You're targeting this at the wrong end. Fine the advertisers for buying the ad space, not the platforms for showing it. Make disclosure of recipients of adver

You're targeting this at the wrong end. Fine the advertisers for buying the ad space, not the platforms for showing it. Make disclosure of recipients of advertising expenditure mandatory for tax purposes. Hiding advertising expenditure? Fraud. Failure to disclose? Well, you don't get tax write-offs on undisclosed expenses, so nobody would do that.