TikTok is again being accused of illegally processing children’s personal data.

The latest claim has been brought by Anne Longfield, the former children’s commissioner for England, who is suing the video-sharing app on behalf of 3.5 million children in the UK.

She alleges that TikTok is violating the GDPR (General Data Protection Regulation) by collecting excessive data and failing to explain what it’s used for.

Children’s data is subject to special protections under the GDPR, including the requirement that privacy policies must be written in a way that’s understandable to the service’s target audience.