Flatpak uses OSTree, like Fedora Atomic Desktops (Silverblue, Kinoite etc) and similar to BTRFS snapshots.
So many files are deduplicated and linked, not actually there
https://gitlab.com/TheEvilSkeleton/flatpak-dedup-checker
50GB without
31GB with deduplication
21,4GB with BTRFS compression
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It is displayed as 76GB but that may include lots of deduplication
Oh, my poor head! I've sworn off flatpak until now because it took up so much disc space, and now you're telling me it uses extradimensional file storage like some kind of TARDIS system?
Ah, I was confused because you used a flatpak deduplication command. Okay, got it. So BTRFS with flatpak is what will do my head in 🙂