René Ritchie is right to compare ad-exchanges to black-boxes, you never know what you’ll get :
We also have no ability to screen ad exchange ads ahead of time; we get what they give us. We can and have set policies, for example, to disallow autoplay video or audio ads. But we get them anyway, even from Google. Whether advertisers make mistakes or try to sneak around the restrictions and don’t get caught, we can’t tell. It happens, though, all the time.
When bad ads appear, we report them and ask that they be disabled. Since different people in different geographies see different ads, it can be a challenge to identify them, and it can take a while to get them pulled. It’s a horrible process for everyone involved.
It’s so bad, our tech team has been exploring their own “bad ads” extension that would identify any resource-heavy ads that violate our policies, and provide us with better information so the ad network can more easily find and kill them. And yes, we’re well aware of how insane that sounds.
Abnormal Capitalist 