People, including me, had a lot of playlists of ripped cds and downloaded mp3s, all categorized, rated, and with years of play count history.
Then apple fucked everyones libraries up completely in an auto update, destroying the metadata and making them unusable, except for songs bought via apple music that is...
"Purposely" seems strong, though. Is it believed that Apple intended this corruption?
It is believed that the bug was ignored or deemed unimportant or worse because of apples preference for users purchasing music via their store, yes.