From what we understand, Mr Navinder Singh Sarao, who is said to live with his parents in a modest suburban semi under Heathrow airport's flight path at Hounslow, is accused of wire and commodities fraud, commodities manipulation and spoofing the market.
Spoofing, where one tries to gain an edge and turn a profit, is a well-known tactic in all markets. The barrow boy who cries 'roll-up, roll-up ladies as I've only got this one box of apples/bedding plants/perfume/jewellery left and they're going fast'. Then promptly proceeds to drag another 10 boxes from the back of his van once you've bought the so-called last one.