Nah, they want us to think they do. But bot clicks are clicks and can be charged. I read somewhere that 80-90% of facebook ad clicks were bots. That seems inline with the traffic I see on some commercial website I work on. Most traffic is from bots, crawlers, scanners and 'security researchers'.
Sometimes I pick up on actual fraud, like 'affiliate marketing' traffic 'boosters' that just result in someone clicking through a banner, making and order and not paying. 200 times in a day. Nobody cares, as long as the stats look good