It shows you a list of trending posts and what % of their upvotes comes from solicited upvote bots. In other words, the post's paying advertisers instead of content creators. And so you can use it to select the ones you think don't deserve the rewards and send the rewards back to the reward pool where it gets distributed back to everybody else on the platform who have pending payouts.

So if you can zoom in on the screenshot above you can see that it shows you what % of the upvotes were bought. These posts and bids can be automated to do this which will run users off the platform eventually if this industry continues to grow on steem.