I don't know this for sure but I don't think the GPS coordinates transfer when you upload a photo.
If you take a screenshot of a paused video there is no location info even if you had your location turned on. when taking the video.
With the new OS on iPhone there is a photo option that allows you to copy only the outlined of fish and/or fish and yourself. Pretty sure no GPS info on that.
Finally, spots..... unless we're talking remote mountain streams I don't think there are many 'secret' spots. Agree with the comments of Paul, John, and Joe.