I love the security aspects and it’s about time that desktop apps cannot access all your files & apps.
But the implementation is IMO improveable. Maybe by the makers of flatpak, maybe by the app developers. A simple Error message like this one would have helped:
Error: Cannot access directory /data, please grant the permission by following these steps (…)
This kind of spam is luckily pretty rare in europe, I get maybe one or two spam calls a year.