short-seller alleging fraud on Cash App, a personal finance app that's part of Jack Dorsey's fintech giant Block, highlights concerns some have about the wider industry. Hindenburg's report referred to Cash App's compliance strategy as a "Wild West" approach and claimed 40% to 75% of Cash App accounts reviewed by former employees were "fake, involved in fraud, or were additional accounts tied to a single individual. Miller is a 30-year fraud expert who has worked at and with banks, fintechs, and neobanks