It was a Davos for digital hucksters. One day last June, scammers from around the world gathered for a conference at a renovated 19th century train station in Berlin. All the most popular hustles were there: miracle diet pills, instant muscle builders, brain boosters, male enhancers. The “You Won an iPhone” companies had display booths, and the “Your Computer May Be Infected” folks sent salesmen. Russia was represented by the promoters of a black-mask face peel, and Canada made a showing with bot-infested dating sites.