Most free web sites pay for their upkeep with ads. It has been an unwritten agreement since forever (or at least as long as there have been ads on the web) that if you consume the content, you pay the creator by looking at the ads on their site.
Consuming the content without looking at the ads is like shoplifting because you don’t like the way a store’s checkout counter works and/or the fact that they want money from you at all.
Another translation of OP’s opinion: walking on the street without looking at storefronts is unfair. Stores pay a substantial rent to be there and a lot of money to renovate and pay people to put up stuff for you to look at. Anyone not looking at these store fronts are robbing people of their money. There should be traffic stops where people have to describe exactly the location, size and content of every ads on the street. Failing to do so should be punished by law.
Sssh. Don’t give them ideas.