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Re:Flatpak: A security nightmare – two years later by vbernat on Friday October 02, 2020 @10:08AM (#24662747)
Flatpak has portals for the same purpose. Unfortunately, many apps don't support portals yet. The Flatpak for Spotify does not allow access to home, only to the music directory (read-only). So, it's running in a proper sandbox too.
Re:Flatpak: A security nightmare – two years later by MrDresden on Friday October 02, 2020 @10:57AM (#24663288)
I don't use Spotify, but have you tried using Flatseal[0], to modify the folder access of the application?

[0]: https://flathub.org/apps/details/com.github.tchx84.Flatseal