The NSA and CIA use ad blockers
As a mid-sized US manufacturer that recently went through a ransomware scare, we contracted with FireEye for remediation and cybersecurity consultation.  I was shocked that they recommended we install ad-blockers as a corporate policy.  I remarked ads are sometimes useful and that many local companies rely upon them (e.g., the local newspaper).  I use an adblocker just to make the internet more useable, but I was reluctant to make that a corporate policy.  I couldn't imagine there was any meaningful threat from malware in ads as every company from the Journal to the Times to Nordstrom would be screwed without ads.  But FireEye insisted and we now have adblocking installed with the usual image.  Wild times.  I have to believe this is truly disruptive to the internet as we know it.  It seems to me the ad providers would have a huge incentive to counter this narrative and to make damned sure ads are safe.  I have no idea why that's not happening.