This includes data such as your faceprints and voice prints, but exactly what they plan to use that data for is unclear. When the publication reached out to the company for clarification, a spokesperson for TikTok said that it would ask for user consent when the data collection process begins.
Prior to this, the app was already found to have been collecting user data without informing them. This was only discovered in iOS 14 where Apple made it so that users would be notified whenever an app attempts to read information from the user’s clipboard. TikTok defended the decision saying it was to combat spammy behavior, but it was later removed.