In practice, however, any system like this, Snapchat, etc is easily defeated with a USB cable and QuickTime's record device screen feature. I suppose it could be useful to others depending on your "threat model", but generally it offers no protection from a savvy computer user after you've unlocked it once.
Edit: Not sure why the downvotes. This is completely correct and you can test it yourself with any iOS app. I've added more explanation to clarify.
In practice, however, any system like this, Snapchat, etc is easily defeated with a USB cable and QuickTime's record device screen feature. I suppose it could be useful to others depending on your "threat model", but generally it offers no protection from a savvy computer user after you've unlocked it once.
Edit: Not sure why the downvotes. This is completely correct and you can test it yourself with any iOS app. I've added more explanation to clarify.