Apple’s Siri AI assistant sends audio of sexual encounters, embarrassing medical information, drug deals, and other private moments recorded without users’ knowledge to human ‘graders’ for evaluation, a whistleblower has revealed.

Recordings from Apple’s Siri voice assistant are fed to human contractors around the world, who grade the AI based on the quality of its response and whether its activation was deliberate, according to an anonymous contractor who spoke to the Guardian. They claimed accidental activations are much more frequent than Apple lets on, especially with Apple Watch users – and wants the company to own up to the problem.