There are blockchain limits, so we need a lot of bidbots because one single bot can only serve max 28,800 upvotes per day without a comment, and only 4,320 upvotes with a comment/receipt, and there are over 1 million accounts and a lot of activity. Remember you can only vote every 3 seconds and comment every 20 seconds, those numbers play a large role in how the bots have a maximum potential.