The Internet sucked before ad blockers. In the 1990s, web sites would spawn several ad windows. Sometimes, they would spawn pop-UNDER windows as well, so when you closed your browser, you had a nice big porn window left on your desktop. Advertisers abused the hell out of visitors and if you complained about it, their response was basically, “HA HA! F*CK YOU! HERE’S ANOTHER AD!”
They could have played nice. But once they had a chance to make free money, greed and sh*tty behavior ruled the day. This is how programs like Web Washer were born.