I don't agree. It's not because you buy votes through bid bots that your article is worth a flag. I don't think it's a good idea because it doesn't take into account the quality of the article.
It's no different from buying ads on Facebook. By doing bid bots, it can create a demand for STEEM and SBD from outside in order to advertise.
Unless the article is bad or misleading, I wouldn't punish people who pay to get trending...because in most cases, it's not even profitable. It also gives a chance for people who would have no other way to get visibility.
Most of that stuff will solve itself when communities will come online since there will no longer be a single trending.
On Facebook, advertised content is marked as advertisement. So how about enforcing "advertisement" as the first tag for every post that has more than 50% bot upvotes and flag all the posts on trending that don't? We certainly need a way to mark ads that are pushed by bid bots, especially the scammy ones.