> 2) With that logic all applications "have" all my files, but you bet I'd find it weird if I caught Libreoffice uploading files of interest to a service of theirs.
On macOS this is not true though, for well-behaved document-based apps! Sandboxing prevents access to anything you haven't explicitly granted access to. I don't know if Libreoffice implements it correctly, though.
And before someone says that this is not feasible for a Dropbox-like application: OneDrive is distributed via the App Store (with its sandboxing requirements).
On macOS this is not true though, for well-behaved document-based apps! Sandboxing prevents access to anything you haven't explicitly granted access to. I don't know if Libreoffice implements it correctly, though.