The Economy of the Internet
Ad companies are not generating enough revenue so website are forced to run more aggressive ads.
Blinking pop ups, banners, auto playing videos and audio commercials.
They've become more annoying and actually makes people click on them less which makes revenues worse.
Anti Ad companies often get paid to let 'less annoying' ads through, but if they're boring enough to let through, they're not very effective anyways.
Will eventually lead to whole system collapsing.
Pay Per Click and Click Fraud
Click Fraud exploits Pay Per Click by automated software programs that click on ads to drive phony clicks.
Google's CFO called Click Fraud the biggest threat to the internet economy.