Your description doesn&#x27;t show why a pharmacist selling illegal drugs is dissimilar to a website selling ad space to illegal ad-space buyers. Any time where you&#x27;ve got multiple producers and multiple retailers, you get middle people like those you describe that must juggle demand and supply. Pharmacists have an equally complex path from producer to customer as ads have from ad-space buyer to website visitor. However, let&#x27;s instead look at the chain of events:<p>An innocent gets malware from an advertisement. The publisher blames the ad-network who in turn blames the criminal. The ad-network claims that they can&#x27;t curate the advertisements or the margins becomes to small. In the end, the innocent has to take the full fallout of the crime.<p>An innocent gets mistreated by a fake doctor. The hospital blames the hiring agency, who in turn blames the criminal. The hiring agency claims that they can&#x27;t do background checks and verify CVs of applicants or the margins becomes to small. In the end, the innocent has to take the full fallout of the crime?<p>Why is there such discrepancy between the two cases? Why can one agency do curation and still function, while the other can&#x27;t? Why can the publisher get away with using a bad ad-network while a hospital is fully legally responsible for using a bad hiring agency? Those seem to be very simple questions, ones that should have very simple answers.