An Australian radio station has come under fire for reportedly using an AI-generated female host for six months without mentioning it before listeners started questioning “her” identity.

Last year, Australian Radio Network’s CADA station, which broadcasts in Sydney, introduced a new host named Thy and even created a new show for her called Workdays with Thy. The young-sounding woman presented music for four hours a day from Monday to Friday, and things went smoothly until people started asking questions about the mysterious Thy. The fact that she had no last name and no biography anywhere was suspicious enough, but then some listeners noticed that certain phrases she used sounded identical every time she uttered them. Questions and theories about Thy’s true identity started spreading online, and CADA eventually revealed that she wasn’t a real person.