I don't think that it's google's fault. Google sometimes trade ads on auctions, meaning they issue and HTTP request to partners asking "Hey, you want to show an ad here", and partner respond with price and HTML code, the highest bidder wins and HTTP code is inserted.
HTTP contains JavaScript, and theoretically anything can be executed within the browser (I've seen people mining bitcoins!).
Google can't monitor an execute every HTML snippet, but they doing pretty great job sampling responses and evaluating some of them. Fraudsters are smart, and trying to understand if the code is executed on Google's servers, but overall they are loosing.
It seems like a case where google's system didn't work.
By they way, all google partners are listed here: https://developers.google.com/third-party-ads/adx-vendors. Usually, it's possible to track down who's exactly responsible by looking at dev console
HTTP contains JavaScript, and theoretically anything can be executed within the browser (I've seen people mining bitcoins!).
Google can't monitor an execute every HTML snippet, but they doing pretty great job sampling responses and evaluating some of them. Fraudsters are smart, and trying to understand if the code is executed on Google's servers, but overall they are loosing.
It seems like a case where google's system didn't work.
By they way, all google partners are listed here: https://developers.google.com/third-party-ads/adx-vendors. Usually, it's possible to track down who's exactly responsible by looking at dev console