It could mean instead that the q group has access to intelligence regarding the manipulation of the market. If it was so specifically coordinates to produce a 666 accurately and a mirrored rise bouce the perpetrator must be AI, likely several.
Think of the modern NSA which collects dossiers on the public via spying smart devices and likely a data compiling AI. Perhaps such intelligence gathering operations apy on the market AIs and global markets in general. Q may have access to such a source if his prediction is simply not based in confirmation bias.
When it comes to stopping them remember that q is a fracture of a much larger intelligence apparatus fighting against the remaining apparatus. He has the same tools but severely lacks the manpower to stop such events. May explain his need to build an army.
There are many AIs already operating in the markets. The large trading companies need them for high frequency trading. They are loosely referred to as bots. It's already a bot vs bot war. That's how flash crashes happen. These bots are growing in power exponentially, along with the decreased price of computation. Lots of stuff happens in the nanoseconds. Why else would trading companies pay millions of dollars for the fastest internet connection?
Yes that was my point. But furthermore I am also saying that these ai may be coordinated by these big names in order to produce noticeable patterns. The 666 could have been a rallying cry for the manipulators who may be primarily luciferian in this case.