I don't think there's any way of knowing why bots do what they...

I don't think there's any way of knowing why bots do what they do. In many cases the creators of the bots probably don't even know. Many of them will be algorithms driven by machine learning that has identified patterns in big data, and are self-learning from market reactions to their own trades.

You know what would really help bot trading, though? Some kind of chip that could store huge amounts of data that can be read and written at enormous speeds and uses minimal power. That would be a fantastic technology for systems relying on pulling data from huge databases Now ... if only someone could invent such a chip ...