This does look really nice!
Have you looked into automatically generating "travel tracks" for each chapter in a Tale from OwnTracks data?[1] An integration like that would definitely make Premium more appealing, and be more interesting than a map with a "pin" on it.
Do you have any plans to add an export ("take out") option that will allow you to download the images, text, captions, etc. as JSON? I worry about investing the time to create some beautiful "tales" but not having a good way to archive them in case you are acquired / shutdown / decide to call it quits.