[JustinJBM]

This is about Company A removing Company B, C, D, & E from the search results so that Company A gets all the sales and leads from that day. Company A would be happy if it scares them away permanently -- then they don't even have to pay the Hacker to deplete their daily budget anymore.

These particular hackers obviously have a service that Google's Invalid Clicks detection cannot pick up and it's successfully depleting advertisers' budgets -- hence the positive reviews they have.

[dangrossman]

Right. You can only remove Company B-E's ads by depleting their daily budgets. The service Company A paid for does not include purchasing Company B-E's products or services, just knocking out their ads. Those advertisers will see a negative ROI from their Google ads and eventually cancel them. Now Google has lost four customers and the one that remains no longer has to compete for ad space. Google loses all of Company B-E's ad spend, and most of Company A's ad spend as it can drastically lower its bids. They are not "still being paid", which is why they are heavily incentivized to identify this fraud and ignore or refund for the clicks that company is generating.