> Advertisers got what they deserved -- annoying pop up windows, animated ads with sound, floating ads, also user tracking

Don't forget the malware that installs over exploited ad networks every few months.

And the inevitable responses from websites: "I'm not responsible for the malware you got from my site, all I did was let an untrusted 3rd party inject arbitrary content into the page, and they did a bad thing with it! Nothing I could have done to prevent it!"

Except, you know, not letting some random jackass with an ad network distribute exploits through your website.