> In general, bots are pretty easy to exclude. They usually advertise themselves by a user agent string. Yes, that can be faked – but it seems highly unlikely that bots using faked user agents create such a large number of impressions that Google has to use this route against them. Is this serious?
Speaking as someone who works at Google, but not on anything at all related to ads, browsers, or ad spam detection, I only wish that the attackers who (try to) make a living out of scamming Google and its advertisers out of money were as incompetent as the author of this article appears to be.