Playlist Follower Reach refers to the total number of followers on the playlist where your song will be featured. For example, if your song is placed on a playlist with 25,000 followers, your Playlist Follower Reach is 25,000.
Keep in mind, Playlist Follower Reach doesn't reflect the number of streams, followers, or saves you will receive. These results depend on several factors, such as your song's position in the playlist, its quality, and more.