> 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.” Something's fishy here. Is there any googler here that…
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That's when you're lucky. If you're unlucky it's malware injected via ad networks.
Browsing the web without an adblocker is like sex with multiple partners every day without a condom.