The web has almost always been unusable without an adblocker. Ads today are less malicious, but more insidious. Clicking the wrong ad in 2003 would brick your computer. Clicking the wrong ad today means you'll have to cancel a credit card after your personal data is compiled and sold on the black market.
Nothing new. Ads don't fuel a free internet. They fuel a business model. The free internet is fueled by the time and donations of kind, dedicated people.