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I was actually trying to think of a bot idea to spend time on. Thanks @vath for your brilliant idea. One more iron that I'll add to the fire.

You're welcome! I wish you the best of luck :)

If you want another idea, then consider making a "Remind Me" type of bot that they have on Reddit. I was just thinking about how I miss that from Reddit. If you are unfamiliar with it, you can call it in the comment section and tell it to remind you of a post/comment in X days/hours/years etc, and it will pop back up and notify you when the timer ends. It's really handy!

Most of them do comment.

Yeah, that's true, but it would be even better with a neutral bot that come in and said something like "this post has bought votes for XX SBD to get upvotes worth XX SBD". This will make buying upvotes completely transparent, and it will be very easy to see which posts that are heavily promoted.

This post for example has almost 500 comments, but I had not even noticed all the bots who upvoted it, because these are pretty much hidden and scattered.