I wonder how much they're automating the protection of their auto-generated playlists (if at all) - for example, does it know if I look at an auto-generated playlist, create a new one, then fill it with all the same songs in the same order?
On the desktop client you can select all songs on a playlist, right click and add to a new playlist. This new lis shows up as able to be transferred with SongShift. I did it last night as a PoC, I’ve done it it previously to customize some Spotify playlists here and there and will be my method going forward to keep lists in sync between services now. Just in case they try to pull access again.
Not as far as I can tell, and I believe they let you do point-in-time copies. I’ve got a copy of mint, formerly electroNow (it was better when it was electroNow) from June 2017 in my collection.