I don't see a lot of agenda behind them though, they don't sell or advertise anything. Are they personal armies? Vote bots farming points to gain downvote privileges? Early versions of bots prompted to be as undetactable as possible before they're unleashed on tougher policed platforms?
Having a botnet to control the conversation between (part of) SV? That sounds like a good enough motive. They just have to be hidden well enough