I wonder what information besides name is used to make the different personal records unique. For instance, there would probably be many people named “John Smith.” Some additional information would be needed to distinguish between the different John Smiths. If starting a record required a lot of relatively obscure information (date of birth, birthplace, parents’ names, mother’s maiden name, etc.), then it would be difficult for anyone other than you and people very close to you to create an entry in the system for you.
I can see two scary scenarios:
1) The app becomes a success, and this sets the expectation that one should be listed there. People not found on the app are considered non-trustworthy by potential employers, dates, etc.
2) Immature people use the app to spread rumors about and play pranks on others (think of junior high students writing snarky negative reviews of their teachers and fellow classmates).