The futures exchange wrote to Sarao on the day of the flash crash, telling him to stop spoofing, and he called them back “and told em to kiss my ass.” And then regulators pondered that reply for five years before deciding that they’d prefer to have him arrested in London and extradited to face criminal spoofing charges.
But the FBI’s and CFTC’s theory here is far more troubling: It suggests that existing algorithms are not just dumb enough to give spoofers some of their money, but dumb enough to give spoofers so much of their money that they destabilize the financial markets. It’s not especially confidence-inspiring to read that a guy with a spreadsheet can trick everyone into thinking that the market is crashing, and thereby cause the market to crash.
Source: Guy Trading at Home Caused the Flash Crash – Bloomberg View