In mid-2025, frustration boiled over for Cedrik Sixtus. Finding his Spotify playlists increasingly sprinkled with tracks he suspected were AI generated, the Leipzig-based software developer built a tool to automatically label and block them from his listening. He uploaded his Spotify AI Blocker to a couple of code-sharing websites, where hundreds have downloaded it. It filters out a growing list of more than 4,700 suspected AI artists, drawing on already existing community tracking efforts, and