It could be done without YouTube and tracking. In theory, FreeTube and Invidious could allow users to opt in to sharing some of their playlists. With those lis

It could be done without YouTube and tracking. In theory, FreeTube and Invidious could allow users to opt in to sharing some of their playlists. With those lists, FreeTube and Invidious would have the data for good suggestions. If they use some form of ActivityPub to share and publish the playlists, there would be an existing infrastructure to moderate and annotate the lists.