Adding this here (and moving it to the top) as a sort of memo for myself, and as an additional reference.
From a text written ny @whatsup, upvoted and resteemed by @timcliff, both users who have been here a long time and helped shape the system with their participation.
(This is only in reference to the numbers/harmfulness and nothing else.)

People who use bidbots lose money...

Some of them do, some of them do not. It is a risk and there is no reason people shouldn't use them if they are creating interesting content and are willing to take the risk.