xdg already provides "portals" and "XDG Intents" that implement most of what android does. Flatpak implements most of the sandboxing you have on android. It doe

xdg already provides "portals" and "XDG Intents" that implement most of what android does. Flatpak implements most of the sandboxing you have on android. It doesn't have feature parity but IMO it doesn't need to. CGroups and systemd-user can prevent apps from running in the background.