A TikTok video shows a young man fanning out a stack of $100 bills. A second flexes his designer clothes. Another man posts a video of himself dancing and wearing a heavy gold chain. They boast to their eager followers about their path to wealth.“BM got me a new car,” states one caption on a video. “$5,000 in a few hours.”Unlike conventional social media influencers hawking travel, brands or recipes, their selling point is crime. The men are all based in Nigeria, and their get-rich-quick scheme ...