[ricardo81]

Worth pointing out if you do some of these crafted operator searches quite quickly, you'll end up getting blocked or having to complete a captcha. I haven't done so in a while so I'm not sure what their current behaviour is.

Main reason being there's plenty data mining, e.g. looking for "powered by wordpress" and vulnerable versions, and generally all kinds of data mining that involve very specific requests for information, likely queries that aren't creating revenue, either.