One advantage is you can build up your data and different apps can re-use that data. Presumably you have to grant permission to use that data but apps could e

One advantage is you can build up your data and different apps can re-use that data. Presumably you have to grant permission to use that data but apps could easily ask for access to much more data than it needs? This seems a little dangerous because people just say "Yes" when they want to use something. Or does it have a strategy for dealing with this?