I once sent a link to a news article to a friend at work. He became angry at me because the link I had sent him was to a malware-infested shit site. It wasn't, but the ads in the site I had intended to send had taken over his browser and made it indistinguishable from a malware link.

That's how showing ads on your site is abuse of the user.

Advertizement uses your brain power to process stimuli for the purpose of trying to sell you things that you do not need.

You did not ask for your brain to be stimulated like this - what you did ask for is the content that comes after ad. That's the thing you consented to.

Ads abuse your desire to watch something that you want to watch, by cramming in something that you did not want, leeching your precious time and brain-processing energy, in order to sell you something that you did not want to have in the first place.