> I'm guessing if bot clicks started making a real dent in advertiser performance, Google would counter that by improving their bot detection so they can refund

> I'm guessing if bot clicks started making a real dent in advertiser performance, Google would counter that by improving their bot detection so they can refund advertisers in higher volumes. They already have methods to detect a lot. Like you said yourself, customers have no alternative, so why would they refund money they don't have to?