Here's a link in today's Washington Post that explains some of the differet iOS adblockers, but which also explains the tension between blocking ads, and the need for sites to use ads to make revenue and survive.
I personally don't mind relatively unobtrusive ads that don't interfere with the ability to enjoy a website. It's the obnoxious ones -- some of them even run in the middle of an article, and as you scroll down, scroll with you and keep blocking text -- that make the web page a total mess, and the content blocker a godsend.