The man from the dating app Hinge checked all of Tho Vu’s boxes.He was a boyishly handsome architect from China, staying in Maryland on a long-term assignment. They had never met in person — he was still waiting to get his Covid-19 booster shot, he said — but they had texted back and forth for months and she’d developed a serious crush. He called her his “little sweetheart,” and told her that he was planning to take her to China to meet his family when the pandemic was over.So when the man, who went by the name Ze Zhao, told Ms. Vu, who works in customer service for a security company, that he could help her make money by trading Bitcoin and other cryptocurrencies, sh …
