Thanks for noticing my comment. I stopped by to check out your blog. The deal with Esta is that anyone that bids in the last 20 minutes of the round gets refunded and then later voted on. So all of those people that appear to be random there had sent bids at an earlier time that were rejected.
There are over 22 upvote services on steembottrackers that are falsely advertising what they provide. Take a peek at this bot black-list https://steemit.com/@royaleagle/black-list-of-false-advertising-upvote-services