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.
Lemmy.one shut down so I wouldn’t use that one anymore