Reason number 48372534786 why it's better just to universally block advertisements on the internet.
Apple has been leading on this front with several initiatives to protect users from malicious ads. One of them was a setting in Safari to only accept cookies from the first-party site, so when you go to cnn.com the browser accepts a cookie from cnn.com but not from malvertiser.com, who has a banner ad on the site.
This upset google because it cut into their business model of selling effective ad space. So google inserted malicious code into webpages to hack the safari browser and override security settings so it could download unwanted and potentially malicious files onto users computers. Because of this, google received the biggest fine in FTC history and is being sued for privacy violations in the UK.
Think about this for a second, and what it means. A website overriding browser security settings to serve unwanted and possibly malicious files. This is outrageous and unethical, and if it were Microsoft then the entire internet community would be enraged. Also think about it in light of this article on malvertisements, which google was actively propagating.
Apple has since taken the cat and mouse game further, so the setting is "allow from current website only". I expect malvertisers to scramble to overcome this block, but I hope that legitimate respected top tier internet companies act a little more ethically.