I'm struggling myself with laws of sharing Apple map snapshot with track information on it. Sent an enquiry to Apple technical support, got redirected to App Review team, got only an answer with guidelines links so far. Read the license info from tapping on "Legal" link and yes all rights are "reserved". Sent a request to Tom Tom asking if they would feel bad about such personal sharing.
Situation is rather sad for Apple if we can't as I'd have to resort to OSM map soon for showing tracks and Apple map use cases in my app (and I guess many others) come to zero.
For the answer, I'm thinking about leaving only one option for saving the map/track snapshot: "Save to camera roll". If user can take a screenshot at any moment, I can just prepare the "better" image with no toolbars etc, and then users can do with image in the camera roll whatever they need to do? I only provide the image they could have cropped themselves? I don't need to care if and how do they share?
So it is just a suggestion to run through and see if it sounds reasonable...