So they can get content without compensating for it.
I've been on this train since the beginning. I was there when ad-block-plus read the writing on the wall 15 years ago and decided to make a truce with advertisers. It was clearly unsustainable for 50% of web users to be effectively parasites, so maybe we can negotiate on acceptable ad practices. But to the users, a truce with advertisers!?!? Ublock Origin was born days later.