I mean fair enough, i use this version of Spotify and don't pay them a single cent: https://bestforandroid.com/apk/spotify-premium-mod-apk/
But if I was a paying customer i would be pretty pissed opening Spotify the first time on my 3 week travels and seeing this crap :-O Funnily there isn't even an option to change the location as suggested. Neither in the modded app nor on spotify.com on FF mobile.
Ahh, I see. Yeah that absolutely shouldn't happen, at least not by default… Though I believe I've added an album that's already in Apple Music once and it also kept the local files. Maybe in those cases it deleted the local files as the disk was getting full to clear up space, or something? Definitely inexcusable though :V