Any dependencies on 3rd parties can be broken at any time without recourse be that Steam, Amazon, Google, Facebook, Apple, or less obvious services on smart devices.
Difficult to avoid though for some cases like streaming. Fortunately I had a backup of my playlists. Still annoying. I wonder if those kinds of things happen with spotify as well. Because once your subscription ends you're only relegated to a free account, not deleted.
Sounds like a lie everything disappeared after 3 months
Maybe if I subscribed again, there still would be something. But I won't.
The support person on the phone also told me that everything gets deleted once the subscription ends, even when it's by mistake. Which seems to have been the case with me.