For years, the web has been largely free thanks to online ads. The problem is that nobody likes them. When they’re not obnoxiously taking over your entire screen or autoplaying, they’re tracking you everywhere you go online.
Ads can track where you go and which sites you visit and can be used to build up profiles on individuals — even if you never click on one. And when you do, they know what you bought and then they share that with other sites so they know you were up late buying ice cream, cat food, or something a little more private.