If only more Linux programs followed sandboxing best practices...
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What is this? A solitaire game?
This could well be an advanced video editor or an office suite if they take full advantage of the portals API without losing any functionality. Well, they can have the network permission, it would still be safe anyway.
I agree with you
however this program can't even create files, although I may have misunderstood it
how are you supposed to save your work?
As I mentioned in my previous comment, they use the portals API to access and save files.