- Nothing.
- Apps may store application specific settings.
- Nope.
- Look, I'm just one dude making stuff. I have zero ambition to obtain, store, analyize, sell or otherwise use your personal information in any way shape or form. Doing so takes money, time, and energy -- all of which are extremely finite to me. Plus that kind of stuff is boring and stupid -- i'd prefer to spend time doing thing i enjoy.