I mentioned Linux specifically because something like this is the hardest to set up on Linux. I (wrongly) assumed that since you were complaining about it not existing, you were on a platform where setting these permissions up isn’t straightforward. App-specific file-acess permissions are on MacOS out of the box as a configurable setting for all applications (in the system settings menu), and I’m pretty sure Windows 10/11 has something similar in its settings menu as well.
Edit: Also, if we’re being pedantic, this is also a setting on both Android and iOS, with Android displaying the option to change access pretty much every time you pick out a file.
Didn’t know it only applied to UWP apps on Windows. That does seem like a pretty big problem then.
I don’t still have a Mac readily available to test with but afaik it is any application that uses Apple’s packaging format. It could also be that it needs to be in the “Applications” folder, but I’m almost certain it isn’t an App Store exclusive feature.