"Flatseal is a graphical utility to review and modify permissions from your Flatpak applications. Simply launch Flatseal, select an application and modify its permissions. Restart the application after making the changes. If anything goes wrong just press the reset button."
(https://github.com/tchx84/Flatseal)
never head of this until now. it's interesting. as far as alexanderzhirov 's problem, and to a smaller extent mine, the implication is some flatpak apps retain root privileges for some things? and that's what you'd use seal for?
paint me intrigued on this one.