Expensify is a popular app that helps employees quickly submit reports for business-related expenses. Expensify’s standout feature is its SmartScan OCR, or optical character recognition, technology. The feature saves data-entry time by scanning your receipt, verifying that the expense is compliant with your employer’s rules, and then organizing it into an expense report — all automatically. When the technology fails, however, Expensify says it has a team of secure technicians to intervene behind the scenes. But Twitter users grew concerned after the discovery of several Expensify receipts on Amazon’s Mechanical Turk service last week.

Mechanical Turk is a crowdsourcing marketplace where anyone can post tasks that need completing for…

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