A Paul Tudor Jones-backed hedge fund that harnesses the stock-picking skills of amateur quants has nabbed another $100 million of inflows after soaring 20% in last year’s market turmoil. San Francisco-based Numerai LLC invests based on the wisdom of crowds by collating trading ideas from the likes of freelance data wonks, engineers and scientists, who are then rewarded with its native cryptocurrency. The unconventional business model is riding a slew of Wall Street fads from democratized trading and crypto to artificial intelligence, but so far it’s working.