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
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Why use flatpak?
Because its a modern package system that is free, focused on making every app run, has isolation, sandboxing and a permission system
And brings the most recent version of something to any system. I'm astounded sometimes by how much a native package can lag behind
Convenient libraries/frameworks are fat. Because they are fat, they need frequent updates/security fixes, breaking codebase more often. With flatpack, developers can freeze lib versions at a convenient point, without caring for system dependencies.
Because has many advantages