https://finance.yahoo.com/news/meet-ico-pumper-makes-living-040031742.html
Interesting interview, a bot created pump and dump. This is what is so concerning about crypto. Little regulation with a ton of opportunity for market manipulations.
However, the idea is not without concern in traditional markets. Who is to say that a market could not be made by bot created puts and calls that drive volume on a thinly traded underlying stock? It only takes small predictable movements to create the opportunity for significant manipulation.