If you're looking for malicious actors in the wild, crypto trading is where you want to be. There's all sorts of things that are ridiculously illegal on proper security exchanges that are de rigeur in cryptos. c.f. Mt. Gox admitting to painting the tape in 2015, a Bitfinex officer with access to the database admitting to trading on his exchange in 2015. A bot set up to detect that sort of thing would have plenty of data to work with.