Romance scams—in which fraudsters pretend to be a love interest to bilk unassuming partners—have surged during the pandemic, compliance officers and regulators say. The scenario is putting some companies on high alert for suspicious financial transactions. Consumers need to be vigilant, she said, but so do companies that are bound by anti-money-laundering rules to report suspicious activity. One thing that can’t be fixed by an algorithm: human gullibility in the face of possible romance.