Can you please explain what exactly bot were doing? What was their goal? Yes, I've seen bot scraping sites, which is expected. But what queries bots were doing towards niche search engine?
Sorry I don't follow. Could please elaborate. You mean bots do query 'cialis' to get an ad-sense ad, while they are the same guys benefiting from ads shown? Or what? I genuinely want to understand the problem and most importantly the motivation.
I don't understand the motivation either, but I think what they are attempting is to make e.g. typing cialis into Google suggest specific queries like the one i showed, which may be so overspecified they provide the spammers' links.
Best guess is they're gambling I'm backed by Google's API and trying to poison their suggestion data.