What could really up the game here is a Proton photo app for Photos and Videos that automatically has a duplicate - cleaner service in it. The ability to tag/ like/ photos according to user face recognition/ gps location I am not sure how that could work with the privacy encryption but could be an optional section within the app. Just to make it easier to find/ catalog and tag pictures and remove duplicate pictures all in one. I can't think of anyone having implemented a duplicate/ similar picture- video cleaner in app.