It has been mentioned here in different threads they are deleted in a 30-90 day time frame. Mine are gone but don't remember how long till they were deleted. I switched to iTunes Match before unsubscribing. And, purchased what I wanted from my Apple Music library before they were deleted. Hence, I still kept my Playlist structure with the songs I wanted to keep. The only thing I remember AM doing that IM doesn't is auto alphabetize my playlists. I have to do that myself on iOS.