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Google has sued two app developers based in China over an alleged scheme targeting 100,000 users globally over four years with at least 87 fraudulent cryptocurrency and other investor apps distributed through the Play Store.

The tech giant alleged that scammers lured victims with “promises of high returns” from “seemingly legitimate” apps offering investment opportunities in cryptocurrencies and other products. Commonly known as “pig-butchering schemes,” these scams displayed fake returns on investments, but when users went to withdraw the funds, they discovered they could not.

In some cases, Google alleged, developers would “double down on the scheme by requesting various fees and other payments from victims that were supposedly necessary for the victims to recover their principal investments and purported gains.”