Reddit users are complaining en masse about other people’s playlists that are automatically added to the Apple Music library.
In some cases, simply unfamiliar playlists are found, and sometimes other people’s traces fall into already discovered playlists.
This is not an Apple ID hack. Exception, blocking failure on Apple servers.
Other people’s playlists are added only to the Music application on the iPhone, in other versions of the system they are not highlighted.
In some cases, you can fix the problem by turning off iCloud Music Library sync and then turning it back on. This can be done via Settings → Music → Library sync.
Source: Iphones RU

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