Hey @Tahney_Millson23,
Thank you for reaching out to the Community and welcome.
Previously, if a user had the URI of a Collaborative public playlist, they could freely add, remove or move songs. This meant that changes could be made by anyone that were hard to reverse in case needed.
Now, Collaborators (authorized by the user who creates the playlist) can only remove items that they've added by themselves. This was implemented to prevent the risk of unauthorized changes on created playlists and also the change is based on the feedback given by the users.
Hope this helps. If anything else comes up, the Community will be here for you.
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