&gt; At any one time, a publisher can be serving ads from a few exchanges, a few different private sellers, and custom built ads for brands. And these all are served in different combinations across several different ad units on multiple pages. And some of those ad sellers may be backfilling with other ad networks, or maybe the publisher is backfilling certain ads from the ad exchanges at certain CPM prices.<p>So, don&#x27;t do that.<p>&gt; It&#x27;s not that simple.<p>It is absolutely that simple.<p>Your argument is basically, &quot;Their process is so complicated they can&#x27;t avoid serving up malware.&quot; But that&#x27;s not a justification for serving up malware. If your process is too complicated to avoid serving malware, then you need to simplify your process until you can avoid serving up malware.<p>You don&#x27;t get a free pass on ethics just because ethics are inconvenient for your business model.