To some degree you have to do that yourself. You want to compare stats. This just sets the bar for running ads at a level where the average web administrator could no longer sell ads. At the end of the day it doesn't matter because the thing that matters more is conversion rate. So you run a test campaign with a platform and if you like the stats their traffic generates (not just total clicks) you keep buying, and if you don't you stop buying. That's on you the ad purchaser, and you have to go through that process no matter what because all traffic is going to be different for about 50 million different reasons beyond just the existence of bots.