If you were concerned about losing your handwriting (if you were say - recently diagnosed with Parkinson's), you might want to have a font made that uses your own handwriting so that you could continue to write with your own style. I think this was one of the primary uses that was envisioned... not necessarily preserving a loved one's handwriting as an archive, but for the affected individual to use day to day.

It's not just about the publicly available font (which is a great tool for awareness), but also the service to capture someone's handwriting as a font.