To prevent abuse, apps with user-generated content or social networking services must include:A method for filtering objectionable material from being posted to the appA mechanism to report offensive content and timely responses to concernsThe ability to block abusive users from the service-Published contact information so users can easily reach you
Seems like Bluesky just barely implemented these features in time?
Edit: markdown swallowed sort of. See https://developer.apple.com/app-store/review/guidelines/ 1.2 user generated content.

The App Review Guidelines provide guidance and examples across a range of development topics, including user interface design, functionality, content, and the use of specific technologies. These guidelines are designed to help you prepare your apps for the approval process.