To be sure this would mean Apple has to allow for 3p installs that have self signing keys that can let one gain visibility into the data of the app(in this case its in the sandboxes), yeah?
An owner of a device in physical possession of it and with the knowledge of all keys and passwords involved, they should be able to get all their personal data stored on it out of it, yes I think so, no matter who signs what on whatever app store.
An owner of a device in physical possession of it and with the knowledge of all keys and passwords involved, they should be able to get all their personal data stored on it out of it, yes I think so, no matter who signs what on whatever app store.