So Google refunds your clicks at billing cycle but doesn't stop them in the first place. So they can essentially stop your ads from rotating . I used to get hit late morning until my ad spend was drained for the day. My ads would no longer show. While Google wouldn't charge me for the fraudulent clicks or at least a part of them. It would result in lost sales and revenue for the remainder of the day a lot more than the cost of the clicks themselves. I now use a third party system online to monitor and control this for me which saves me a lot more than it costs and keeps the revenue