If I may, there is a "niche", but most probably economically valid market in professional digital forensics and/or data recovery.
The first (obvious) use is tapping access codes or swiping patterns to unlock a device (when/if the number of attempts is resettable [1]).
The second is to document contents, on some phones (unlocked but for which there is no available imaging/copying solution or for specific apps for which there is no external reader), the current procedure is (say a communication app) to manually have a message on the screen, take a photo of it, swipe to the next one, take another photo, etc.
