I guess that just depends on the axis orientation...
But there is nothing inherently wrong about removing pure garbage ads.
Of course, one might object that it would give more visibility to harder-to-discern bad ads, and make the consumer less wary of ads if they are less used to see them with obviously wrong information. Double edged sword as always, and I would certainly ban them. Or every ad, for that matter. But that's google, it is their business model, so what are you expecting?
